Symbian

This article is about the operating system. For other uses, see Symbian (disambiguation).

Symbian

File:Belle shot.jpg Home screen of Nokia Belle (Symbian OS 10.1)
Developer	Accenture on behalf of Nokia
Written in	C++
OS family	Embedded operating system
Working state	Current (To receive updates from Accenture until at least 2016)
Source model	Proprietary
Initial release	1997 as EPOC32
Latest release	Nokia Belle Feature Pack 1 (Updated Symbian^3)
Marketing target	Smartphones
Platforms	ARM, x86
Kernel type	Real Time Microkernel
Default user interface	Avkon (Graphical)
License	Proprietary
Official website	europe.nokia.com/belle/

Symbian is a mobile operating system (OS) and computing platform designed for smartphones and currently maintained by Accenture. The Symbian platform is the successor to Symbian OS and Nokia Series 60; unlike Symbian OS, which needed an additional user interface system, Symbian includes a user interface component based on S60 5th Edition. The latest version, Symbian^3, was officially released in Q4 2010, first used in the Nokia N8. In May 2011 an update, Symbian Anna, was officially announced, followed by Nokia Belle (previously Symbian Belle) in August 2011.

Symbian OS was originally developed by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARM processors, although an unreleased x86 port existed.

Some estimates indicate that the number of mobile devices shipped with the Symbian OS up to the end of Q2 2010 is 385 million.

By April 5, 2011, Nokia released Symbian under a new license and converted to a proprietary model as opposed to an open source project.

On February 11, 2011, Nokia announced that it would migrate from Symbian to Windows Phone 7. Nokia CEO Stephen Elop announced Nokia's first Windows phones at Nokia World 2011: the Lumia 800 and Lumia 710. These phones were launched on November 14, 2011. On June 22, 2011 Nokia made an agreement with Accenture for an outsourcing program. Accenture will provide Symbian-based software development and support services to Nokia through 2016; about 2,800 Nokia employees became Accenture employees as of October 2011. The transfer was completed on September 30, 2011.

History

Main articles: History of Symbian, S60 (software platform), MOAP, and UIQ

The Nokia C7 running the Nokia Belle OS

The Symbian platform was created by merging and integrating software assets contributed by Nokia, NTT DoCoMo, Sony Ericsson and Symbian Ltd., including Symbian OS assets at its core, the S60 platform, and parts of the UIQ and MOAP(S) user interfaces.

In December 2008, Nokia bought Symbian Ltd., the company behind Symbian OS; consequently, Nokia became the major contributor to Symbian's code, since it then possessed the development resources for both the Symbian OS core and the user interface. Since then Nokia has been maintaining its own code repository for the platform development, regularly releasing its development to the public repository. Symbian was intended to be developed by a community led by the Symbian Foundation, which was first announced in June 2008 and which officially launched in April 2009. Its objective was to publish the source code for the entire Symbian platform under the OSI- and FSF-approved Eclipse Public License (EPL). The code was published under EPL on 4 February 2010; Symbian Foundation reported this event to be the largest codebase transitioned to Open Source in history.

However, some important components within Symbian OS were licensed from third parties, which prevented the foundation from publishing the full source under EPL immediately; instead much of the source was published under a more restrictive Symbian Foundation License (SFL) and access to the full source code was limited to member companies only, although membership was open to any organisation.

In November 2010, the Symbian Foundation announced that due to a lack of support from funding members, it would transition to a licensing-only organisation; Nokia announced it would take over the stewardship of the Symbian platform. Symbian Foundation will remain the trademark holder and licensing entity and will only have non-executive directors involved.

On February 11, 2011, Nokia announced a partnership with Microsoft that would see it adopt Windows Phone 7 for smartphones, reducing the number of devices running Symbian over the coming two years. As a consequence, the use of the Symbian platform for building mobile applications dropped rapidly. Research in June 2011 indicated that over 39% of mobile developers using Symbian at the time of publication were planning to abandon the platform.

By April 5, 2011, Nokia ceased to open source any portion of the Symbian software and reduced its collaboration to a small group of pre-selected partners in Japan. Source code released under the EPL remains available in third party repositories.

Version history

Main article: History of Symbian

Version	Description
EPOC16	EPOC16, originally simply named EPOC, was the operating system developed by Psion in the late 1980s and early 1990s for Psion's "SIBO" (SIxteen Bit Organisers) devices. All EPOC16 devices featured an 8086-family processor and a 16-bit architecture. EPOC16 was a single-user preemptive multitasking operating system, written in Intel 8086 assembler language and C and designed to be delivered in ROM. It supported a simple programming language called Open Programming Language (OPL) and an integrated development environment (IDE) called OVAL. SIBO devices included the: MC200, MC400, Series 3 (1991–98), Series 3a, Series 3c, Series 3mx, Siena, Workabout and Workabout mx. The MC400 and MC200, the first EPOC16 devices, shipped in 1989. EPOC16 featured a primarily 1-bit-per-pixel, keyboard-operated graphical interface — the hardware for which it was designed did not have pointer input. In the late 1990s, the operating system was referred to as EPOC16 to distinguish it from Psion's then-new EPOC32 OS.
EPOC32 (releases 1 to 5)	The first version of EPOC32, Release 1 appeared on the Psion Series 5 ROM v1.0 in 1997. Later, ROM v1.1 featured Release 3 (Release 2 was never publicly available.) These were followed by the Psion Series 5mx, Revo / Revo plus, Psion Series 7 / netBook and netPad (which all featured Release 5). The EPOC32 operating system, at the time simply referred to as EPOC, was later renamed Symbian OS. Adding to the confusion with names, before the change to Symbian, EPOC16 was often referred to as SIBO to distinguish it from the "new" EPOC. Despite the similarity of the names, EPOC32 and EPOC16 were completely different operating systems, EPOC32 being written in C++ from a new codebase with development beginning during the mid 1990s. EPOC32 was a pre-emptive multitasking, single user operating system with memory protection, which encourages the application developer to separate their program into an engine and an interface. The Psion line of PDAs come with a graphical user interface called EIKON which is specifically tailored for handheld machines with a keyboard (thus looking perhaps more similar to desktop GUIs than palmtop GUIs). However, one of EPOC's characteristics is the ease with which new GUIs can be developed based on a core set of GUI classes, a feature which has been widely explored from Ericsson R380 and onwards. EPOC32 was originally developed for the ARM family of processors, including the ARM7, ARM9, StrongARM and Intel's XScale, but can be compiled towards target devices using several other processor types. During the development of EPOC32, Psion planned to license EPOC to third-party device manufacturers, and spin off its software division as Psion Software. One of the first licensees was the short-lived Geofox, which halted production with less than 1,000 units sold. Ericsson marketed a rebranded Psion Series 5mx called the MC218, and later created the EPOC Release 5.1 based smartphone, the R380. Oregon Scientific also released a budget EPOC device, the Osaris (notable as the only EPOC device to ship with Release 4). Work started on the 32-bit version in late 1994. The Series 5 device, released in June 1997, used the first iterations of the EPOC32 OS, codenamed "Protea", and the "Eikon" graphical user interface. The Oregon Scientific Osaris was the only PDA to use the ER4. The Psion Series 5mx, Psion Series 7, Psion Revo, Diamond Mako, Psion netBook and Ericsson MC218 were released in 1999 using ER5. A phone project was announced at CeBIT, the Phillips Illium/Accent, but did not achieve a commercial release. This release has been retrospectively dubbed Symbian OS 5. The first phone using ER5u, the Ericsson R380 was released in November 2000. It was not an 'open' phone – software could not be installed. Notably, a number of never-released Psion prototypes for next generation PDAs, including a Bluetooth Revo successor codenamed "Conan" were using ER5u. The 'u' in the name refers to the fact that it supported Unicode. In June 1998, Psion Software became Symbian Ltd., a major joint venture between Psion and phone manufacturers Ericsson, Motorola, and Nokia. As of Release 6, EPOC became known simply as Symbian OS.
Symbian OS 6.0 and 6.1	The OS was renamed Symbian OS and was envisioned as the base for a new range of smartphones. This release is sometimes called ER6. Psion gave 130 key staff to the new company and retained a 31% shareholding in the spin-off. The first 'open' Symbian OS phone, the Nokia 9210 Communicator, was released in June 2001. Bluetooth support was added. Almost 500,000 Symbian phones were shipped in 2001, rising to 2.1 million the following year. Development of different UIs was made generic with a "reference design strategy" for either 'smartphone' or 'communicator' devices, subdivided further into keyboard- or tablet-based designs. Two reference UIs (DFRDs or Device Family Reference Designs) were shipped – Quartz and Crystal. The former was merged with Ericsson's 'Ronneby' design and became the basis for the UIQ interface; the latter reached the market as the Nokia Series 80 UI. Later DFRDs were Sapphire, Ruby, and Emerald. Only Sapphire came to market, evolving into the Pearl DFRD and finally the Nokia Series 60 UI, a keypad-based 'square' UI for the first true smartphones. The first one of them was the Nokia 7650 smartphone (featuring Symbian OS 6.1), which was also the first with a built-in camera, with VGA (0.3 Mpx = 640×480) resolution. Other notable S60 Symbian 6.1 devices are the Nokia 3650, the short lived Sendo X and Siemens SX1 - the first and the last Symbian phone from Siemens. Despite these efforts to be generic, the UI was clearly split between competing companies: Crystal or Sapphire was Nokia, Quartz was Ericsson. DFRD was abandoned by Symbian in late 2002, as part of an active retreat from UI development in favour of 'headless' delivery. Pearl was given to Nokia, Quartz development was spun off as UIQ Technology AB, and work with Japanese firms was quickly folded into the MOAP standard.
Symbian OS 7.0 and 7.0s	First shipped in 2003. This is an important Symbian release which appeared with all contemporary user interfaces including UIQ (Sony Ericsson P800, P900, P910, Motorola A925, A1000), Series 80 (Nokia 9300, 9500), Series 90 (Nokia 7710), Series 60 (Nokia 3230, 6260, 6600, 6670, 7610) as well as several FOMA phones in Japan. It also added EDGE support and IPv6. Java support was changed from pJava and JavaPhone to one based on the Java ME standard. One million Symbian phones were shipped in Q1 2003, with the rate increasing to one million a month by the end of 2003. Symbian OS 7.0s was a version of 7.0 special adapted to have greater backward compatibility with Symbian OS 6.x, partly for compatibility between the Communicator 9500 and its predecessor the Communicator 9210. In 2004, Psion sold its stake in Symbian. The same year, the first worm for mobile phones using Symbian OS, Cabir, was developed, which used Bluetooth to spread itself to nearby phones. See Cabir and Symbian OS threats.
Symbian OS 8.0	First shipped in 2004, one of its advantages would have been a choice of two different kernels (EKA1 or EKA2). However, the EKA2 kernel version did not ship until Symbian OS 8.1b. The kernels behave more or less identically from user-side, but are internally very different. EKA1 was chosen by some manufacturers to maintain compatibility with old device drivers, while EKA2 was a real-time kernel. 8.0b was deproductised in 2003. Also included were new APIs to support CDMA, 3G, two-way data streaming, DVB-H, and OpenGL ES with vector graphics and direct screen access.
Symbian OS 8.1	An improved version of 8.0, this was available in 8.1a and 8.1b versions, with EKA1 and EKA2 kernels respectively. The 8.1b version, with EKA2's single-chip phone support but no additional security layer, was popular among Japanese phone companies desiring the real-time support but not allowing open application installation. The first and maybe the most famous smartphone featuring Symbian OS 8.1a was Nokia N90 in 2005, Nokia's first in Nseries.
Symbian OS 9.0	Symbian OS 9.0 was used for internal Symbian purposes only. It was de-productised in 2004. 9.0 marked the end of the road for EKA1. 8.1a is the final EKA1 version of Symbian OS. Symbian OS has generally maintained reasonable binary code compatibility. In theory the OS was BC from ER1-ER5, then from 6.0 to 8.1b. Substantial changes were needed for 9.0, related to tools and security, but this should be a one-off event. The move from requiring ARMv4 to requiring ARMv5 did not break backwards compatibility.
Symbian OS 9.1	Released early 2005. It includes many new security related features, including platform security module facilitating mandatory code signing. The new ARM EABI binary model means developers need to retool and the security changes mean they may have to recode. S60 platform 3rd Edition phones have Symbian OS 9.1. Sony Ericsson is shipping the M600 and P990 based on Symbian OS 9.1. The earlier versions had a defect where the phone hangs temporarily after the owner sent a large number of SMS'es. However, on 13 September 2006, Nokia released a small program to fix this defect. Support for Bluetooth 2.0 was also added. Symbian 9.1 introduced capabilities and a Platform Security framework. To access certain APIs, developers have to sign their application with a digital signature. Basic capabilities are user-grantable and developers can self-sign them, while more advanced capabilities require certification and signing via the Symbian Signed program, which uses independent 'test houses' and phone manufacturers for approval. For example, file writing is a user-grantable capability while access to Multimedia Device Drivers require phone manufacturer approval. A TC TrustCenter ACS Publisher ID certificate is required by the developer for signing applications.
Symbian OS 9.2	Released Q1 2006. Support for OMA Device Management 1.2 (was 1.1.2). Vietnamese language support. S60 3rd Edition Feature Pack 1 phones have Symbian OS 9.2. Nokia phones with Symbian OS 9.2 OS include the Nokia E71, Nokia E90, Nokia N95, Nokia N82, Nokia N81 and Nokia 5700.
Symbian OS 9.3	Released on 12 July 2006. Upgrades include improved memory management and native support for Wifi 802.11, HSDPA. The Nokia E72, Nokia 5730 XpressMusic, Nokia N79, Nokia N96, Nokia E52, Nokia E75, Nokia 5320 XpressMusic, Sony Ericsson P1 and others feature Symbian OS 9.3.
Symbian OS 9.4	Announced in March 2007. Provides the concept of demand paging which is available from v9.3 onwards. Applications should launch up to 75% faster. Additionally, SQL support is provided by SQLite. Ships with the Samsung i8910 Omnia HD, Nokia N97, Nokia N97 mini, Nokia 5800 XpressMusic, Nokia 5530 XpressMusic, Nokia 5228, Nokia 5230, Nokia 5233, Nokia 5235, Nokia C6-00, Nokia X6, Sony Ericsson Satio, Sony Ericsson Vivaz and Sony Ericsson Vivaz Pro, Micromax x265. Used as the basis for Symbian^1, the first Symbian platform release. The release is also better known as S60 5th edition, as it is the bundled interface for the OS.
Symbian^2	Symbian^2 is a version of Symbian that only used by Japanese manufacturers, started selling in Japan market since May of 2010. The version is not used by Nokia.
Symbian^3 (Symbian OS 9.5) and Symbian Anna	Symbian^3 is a big improvement over previous S60 5th Edition and features single touch menus in the user interface, as well as new Symbian OS kernel with hardware-accelerated graphics; further improvements will come in the first half of 2011 including portrait qwerty keyboard, a new browser and split-screen text input. Nokia announced that updates to Symbian^3 interface will be delivered gradually, as they are available; Symbian^4, the previously planned major release, is now discontinued and some of its intended features will be incorporated into Symbian^3 in successive releases, starting with Symbian Anna.
Nokia Belle (Symbian OS 10.1)	In the summer of 2011 videos showing an early leaked version of Symbian Belle (original name of Nokia Belle) running on a Nokia N8 were published on YouTube. On August 24, 2011, Nokia announced it officially for three new smartphones, the Nokia 600 (later replaced by Nokia 603), Nokia 700, and Nokia 701. Nokia officially renamed Symbian Belle to Nokia Belle in a company blog post. Nokia Belle adds to the Anna improvements with a pull-down status/notification bar, deeper near field communication integration, free-form re-sizable homescreen widgets, and six homescreens instead of the previous three. As of February 7th 2012, Nokia Belle update is available for most phone models through Nokia Suite, coming later to Australia. Users can check the availability on Nokia homepage. On March 1, 2012, Nokia announced a Feature Pack 1 update for Nokia Belle which will be available as an update to Nokia 603, 700, 701 (excluding others), and for Nokia 808 PureView natively.

Features

User interface

Symbian has had a native graphics toolkit since its inception, known as AVKON (formerly known as Series 60). S60 was designed to be manipulated by a keyboard-like interface metaphor, such as the ~15-key augmented telephone keypad, or the mini-QWERTY keyboards. AVKON-based software is binary-compatible with Symbian versions up to and including Symbian^3.

Symbian^3 includes the Qt framework, which is now the recommended user interface toolkit for new applications. Qt can also be installed on older Symbian devices.

Symbian^4 was planned to introduce a new GUI library framework specifically designed for a touch-based interface, known as "UI Extensions for Mobile" or UIEMO (internal project name "Orbit"), which was built on top of Qt Widget; a preview was released in January 2010, however in October 2010 Nokia announced that Orbit/UIEMO has been cancelled.

Nokia currently recommends that developers use Qt Quick with QML, the new high-level declarative UI and scripting framework for creating visually rich touchscreen interfaces that allows development for both Symbian and MeeGo; it will be delivered to existing Symbian^3 devices as a Qt update. When more applications gradually feature a user interface reworked in Qt, the legacy S60 framework (AVKON) will be deprecated and no longer included with new devices at some point, thus breaking binary compatibility with older S60 applications.

Browser

Main articles: S60 browser and Opera Mobile

Symbian^3 and earlier have a native WebKit based browser; indeed, Symbian was the first mobile platform to make use of WebKit (in June 2005). Some older Symbian models have Opera Mobile as their default browser.

Nokia released a new browser with the release of Symbian Anna with improved speed and an improved user interface.

Multiple language support

Symbian has strong localization support enabling manufacturers and 3rd party application developers to localize their Symbian based products in order to support global distribution.

Current Symbian release (Symbian Belle) has support for 48 languages, which Nokia makes available on device in language packs (set of languages which cover the languages commonly spoken in the area where the device variant is intended to be sold). All language packs have in common English (or a locally relevant dialect of it).

The supported languages [with dialects] (and scripts) in Symbian Belle are:

Arabic (Arabic), Basque (Latin), Bulgarian (Cyrillic), Catalan (Latin), Chinese [PRC] (Simplified Chinese), Chinese [Hong Kong] (Traditional Chinese), Chinese [Taiwan] (Traditional Chinese), Croatian (Latin), Czech (Latin), Danish (Latin), Dutch (Latin), English [UK] (Latin),

English [US] (Latin), Estonian (Latin), Finnish (Latin), French (Latin), French [Canadian] (Latin), Galician (Latin), German (Latin), Greek (Greek), Hebrew (Hebrew), Hindi (Hi), Hungarian (Latin), Icelandic (Latin), Indonesian [Bahasa Indonesia] (Latin),

Italian (Latin), Kazakh (Cyrillic), Latvian (Latin), Lithuanian (Latin), Malay [Bahasa Malaysia] (Latin), Norwegian (Latin), Persian [Farsi] (Arabic), Polish (Latin), Portuguese (Latin), Portuguese [Brazilian] (Latin), Romanian [Romania] (Latin), Russian (Cyrillic),

Serbian (Latin), Slovak (Latin), Slovene (Latin), Spanish (Latin), Spanish [Latin America] (Latin), Swedish (Latin), Tagalog [Filipino] (Latin), Thai (Thai), Turkish (Latin), Ukrainian (Cyrillic), Urdu (Arabic), Vietnamese (Latin).

Symbian Belle marks the introduction of Kazakh, while Japanese and Korean is no longer supported.

Application development

From 2010, Symbian switched to using standard C++ with Qt as the main SDK, which can be used with either Qt Creator or Carbide.c++. Qt supports the older Symbian/S60 3rd (starting with Feature Pack 1, aka S60 3.1) and Symbian/S60 5th Edition (aka S60 5.0) releases, as well as the new Symbian platform. It also supports Maemo and MeeGo, Windows, Linux and Mac OS X.

Alternative application development can be done using Python (see Python for S60), Adobe Flash Lite or Java ME.

Symbian OS previously used a Symbian specific C++ version, along with Carbide.c++ integrated development environment (IDE), as the native application development environment.

Web Run time (WRT) is a portable application framework that allows creating widgets on the S60 Platform; it is an extension to the S60 WebKit based browser that allows launching multiple browser instances as separate JavaScript applications.

Application development

Qt

As of 2010, the SDK for Symbian is standard C++, using Qt. It can be used with either Qt Creator, or Carbide (the older IDE previously used for Symbian development). A phone simulator allows testing of Qt apps. Apps compiled for the simulator are compiled to native code for the development platform, rather than having to be emulated. Application development can either use C++ or QML.

Symbian C++

As Symbian OS is written in C++ using Symbian Software's coding standards, it is naturally possible to develop using Symbian C++, although it is not a standard implementation. Before the release of the Qt SDK, this was the standard development environment. There were multiple platforms based on Symbian OS that provided software development kit (SDKs) for application developers wishing to target Symbian OS devices, the main ones being UIQ and S60. Individual phone products, or families, often had SDKs or SDK extensions downloadable from the maker's website too.

The SDKs contain documentation, the header files and library files needed to build Symbian OS software, and a Windows-based emulator ("WINS"). Up until Symbian OS version 8, the SDKs also included a version of the GNU Compiler Collection (GCC) compiler (a cross-compiler) needed to build software to work on the device.

Symbian OS 9 and the Symbian platform use a new application binary interface (ABI) and needed a different compiler. A choice of compilers is available including a newer version of GCC (see external links below).

Unfortunately, Symbian C++ programming has a steep learning curve, as Symbian C++ requires the use of special techniques such as descriptors, active objects and the cleanup stack. This can make even relatively simple programs initially harder to implement than in other environments. It is possible that the techniques, developed for the much more restricted mobile hardware and compliers of the 1990s, caused extra complexity in source code because programmers are required to concentrate on low-level details instead of more application-specific features. As of 2010, these issues are no longer the case when using standard C++, with the Qt SDK.

Symbian C++ programming is commonly done with an integrated development environment (IDE). For earlier versions of Symbian OS, the commercial IDE CodeWarrior for Symbian OS was favoured. The CodeWarrior tools were replaced during 2006 by Carbide.c++, an Eclipse-based IDE developed by Nokia. Carbide.c++ is offered in four different versions: Express, Developer, Professional, and OEM, with increasing levels of capability. Fully featured software can be created and released with the Express edition, which is free. Features such as UI design, crash debugging etc. are available in the other, charged-for, editions. Microsoft Visual Studio 2003 and 2005 are also supported via the Carbide.vs plugin.

Other languages

Symbian devices can also be programmed using Python, Java ME, Flash Lite, Ruby, .NET, Web Runtime (WRT) Widgets and Standard C/C++.

Visual Basic programmers can use NS Basic to develop apps for S60 3rd Edition and UIQ 3 devices.

In the past, Visual Basic, Visual Basic .NET, and C# development for Symbian were possible through AppForge Crossfire, a plugin for Microsoft Visual Studio. On 13 March 2007 AppForge ceased operations; Oracle purchased the intellectual property, but announced that they did not plan to sell or provide support for former AppForge products. Net60, a .NET compact framework for Symbian, which is developed by redFIVElabs, is sold as a commercial product. With Net60, VB.NET and C# (and other) source code is compiled into an intermediate language (IL) which is executed within the Symbian OS using a just-in-time compiler. (As of 18/1/10 RedFiveLabs has ceased development of Net60 with this announcement on their landing page: "At this stage we are pursuing some options to sell the IP so that Net60 may continue to have a future".)

There is also a version of a Borland IDE for Symbian OS. Symbian OS development is also possible on Linux and Mac OS X using tools and methods developed by the community, partly enabled by Symbian releasing the source code for key tools. A plugin that allows development of Symbian OS applications in Apple's Xcode IDE for Mac OS X was available.

Java ME applications for Symbian OS are developed using standard techniques and tools such as the Sun Java Wireless Toolkit (formerly the J2ME Wireless Toolkit). They are packaged as JAR (and possibly JAD) files. Both CLDC and CDC applications can be created with NetBeans. Other tools include SuperWaba, which can be used to build Symbian 7.0 and 7.0s programs using Java.

Nokia S60 phones can also run Python scripts when the interpreter Python for S60 is installed, with a custom made API that allows for Bluetooth support and such. There is also an interactive console to allow the user to write Python scripts directly from the phone.

Deployment

Once developed, Symbian applications need to find a route to customers' mobile phones. They are packaged in SIS files which may be installed over-the-air, via PC connect, Bluetooth or on a memory card. An alternative is to partner with a phone manufacturer and have the software included on the phone itself. Applications must be Symbian Signed for Symbian OS 9.x in order to make use of certain capabilities (system capabilities, restricted capabilities and device manufacturer capabilities). Applications can now be signed for free.

Architecture

Technology domains and packages

Symbian's design is subdivided into technology domains, each of which comprises a number of software packages. Each technology domain has its own roadmap, and the Symbian Foundation has a team of technology managers who manage these technology domain roadmaps.

Every package is allocated to exactly one technology domain, based on the general functional area to which the package contributes and by which it may be influenced. By grouping related packages by themes, the Symbian Foundation hopes to encourage a strong community to form around them and to generate discussion and review.

The Symbian System Model illustrates the scope of each of the technology domains across the platform packages.

Packages are owned and maintained by a package owner, a named individual from an organization member of the Symbian Foundation, who accepts code contributions from the wider Symbian community and is responsible for package.

Symbian kernel

The Symbian kernel (EKA2) supports sufficiently fast real-time response to build a single-core phone around it—that is, a phone in which a single processor core executes both the user applications and the signalling stack. The real-time kernel has a microkernel architecture containing only the minimum, most basic primitives and functionality, for maximum robustness, availability and responsiveness. It has been termed a nanokernel, because it needs an extended kernel to implement any other abstractions. It contains a scheduler, memory management and device drivers, with networking, telephony and file system support services in the OS Services Layer or the Base Services Layer. The inclusion of device drivers means the kernel is not a true microkernel.

Design

Symbian features pre-emptive multitasking and memory protection, like other operating systems (especially those created for use on desktop computers). EPOC's approach to multitasking was inspired by VMS and is based on asynchronous server-based events.

Symbian OS was created with three systems design principles in mind:

1. the integrity and security of user data is paramount
2. user time must not be wasted
3. all resources are scarce

To best follow these principles, Symbian uses a microkernel, has a request-and-callback approach to services, and maintains separation between user interface and engine. The OS is optimised for low-power battery-based devices and for ROM-based systems (e.g. features like XIP and re-entrancy in shared libraries). Applications, and the OS itself, follow an object-oriented design: Model-view-controller (MVC).

Later OS iterations diluted this approach in response to market demands, notably with the introduction of a real-time kernel and a platform security model in versions 8 and 9.

There is a strong emphasis on conserving resources which is exemplified by Symbian-specific programming idioms like descriptors and a cleanup stack. Similar methods exist to conserve disk space, though disks on Symbian devices are usually flash memory. Further, all Symbian programming is event-based, and the central processing unit (CPU) is switched into a low power mode when applications are not directly dealing with an event. This is done via a programming idiom called active objects. Similarly the Symbian approach to threads and processes is driven by reducing overheads.

Operating system

The All over Model contains the following layers, from top to bottom:

• UI Framework Layer
• Application Services Layer
  • Java ME
• OS Services Layer
  • generic OS services
  • communications services
  • multimedia and graphics services
  • connectivity services
• Base Services Layer
• Kernel Services & Hardware Interface Layer

The Base Services Layer is the lowest level reachable by user-side operations; it includes the File Server and User Library, a Plug-In Framework which manages all plug-ins, Store, Central Repository, DBMS and cryptographic services. It also includes the Text Window Server and the Text Shell: the two basic services from which a completely functional port can be created without the need for any higher layer services.

Symbian has a microkernel architecture, which means that the minimum necessary is within the kernel to maximise robustness, availability and responsiveness. It contains a scheduler, memory management and device drivers, but other services like networking, telephony and filesystem support are placed in the OS Services Layer or the Base Services Layer. The inclusion of device drivers means the kernel is not a true microkernel. The EKA2 real-time kernel, which has been termed a nanokernel, contains only the most basic primitives and requires an extended kernel to implement any other abstractions.

Symbian is designed to emphasise compatibility with other devices, especially removable media file systems. Early development of EPOC led to adopting FAT as the internal file system, and this remains, but an object-oriented persistence model was placed over the underlying FAT to provide a POSIX-style interface and a streaming model. The internal data formats rely on using the same APIs that create the data to run all file manipulations. This has resulted in data-dependence and associated difficulties with changes and data migration.

There is a large networking and communication subsystem, which has three main servers called: ETEL (EPOC telephony), ESOCK (EPOC sockets) and C32 (responsible for serial communication). Each of these has a plug-in scheme. For example, ESOCK allows different ".PRT" protocol modules to implement various networking protocol schemes. The subsystem also contains code that supports short-range communication links, such as Bluetooth, IrDA and USB.

There is also a large volume of user interface (UI) Code. Only the base classes and substructure were contained in Symbian OS, while most of the actual user interfaces were maintained by third parties. This is no longer the case. The three major UIs — S60, UIQ and MOAP — were contributed to Symbian in 2009. Symbian also contains graphics, text layout and font rendering libraries.

All native Symbian C++ applications are built up from three framework classes defined by the application architecture: an application class, a document class and an application user interface class. These classes create the fundamental application behaviour. The remaining needed functions, the application view, data model and data interface, are created independently and interact solely through their APIs with the other classes.

Many other things do not yet fit into this model — for example, SyncML, Java ME providing another set of APIs on top of most of the OS and multimedia. Many of these are frameworks, and vendors are expected to supply plug-ins to these frameworks from third parties (for example, Helix Player for multimedia codecs). This has the advantage that the APIs to such areas of functionality are the same on many phone models, and that vendors get a lot of flexibility. But it means that phone vendors needed to do a great deal of integration work to make a Symbian OS phone.

Symbian includes a reference user-interface called "TechView." It provides a basis for starting customisation and is the environment in which much Symbian test and example code runs. It is very similar to the user interface from the Psion Series 5 personal organiser and is not used for any production phone user interface.

Devices and feature comparison

File:Nokia N8 Smartphone.jpg

The Nokia N8 running with Nokia Belle (Symbian OS 10.1)

On 16 November 2006, the 100 millionth smartphone running the OS was shipped. As of 21 July 2009, more than 250 million devices running Symbian OS had been shipped.

• The Nokia S60 interface is used in various phones, the first being the Nokia 7650. The Nokia N-Gage and Nokia N-Gage QD gaming/smartphone combos are also S60 platform devices. It was also used on other manufacturers' phones such as the Siemens SX1 and Samsung SGH-Z600. Recently, more advanced devices using S60 include the Nokia 6xxx, the Nseries (except Nokia N8xx and N9xx), the Eseries and some models of the Nokia XpressMusic mobiles.
• Fujitsu, Mitsubishi, Sony Ericsson and Sharp developed phones for NTT DoCoMo in Japan, using an interface developed specifically for DoCoMo's FOMA "Freedom of Mobile Access" network brand. This UI platform is called MOAP "Mobile Oriented Applications Platform" and is based on the UI from earlier Fujitsu FOMA models. The user cannot install new C++ applications.

User interfaces that run on or are based on Symbian OS include:

• S60, formerly Series 60, used by Nokia and others
• Series 80, previously used by Nokia
• Series 90, previously used by Nokia
• UIQ, previously used by Sony-Ericsson and many other manufacturers
• MOAP, Mobile Oriented Applications Platform, used by NTT DoCoMo's FOMA service
• OPP, successor of MOAP, used on NTT DoCoMo's FOMA phone

Versions that are actively marketed as of September 2011 are Symbian^3 (and its updated Symbian Anna and Nokia Belle variants), Symbian^2, Symbian^1 (previously known as Series 60 5th Edition), and Series 60 3rd Edition Feature Pack 2. For features of older versions, see history of Symbian. Note that the operating system supporting a certain feature does not imply that all devices running on it have that feature available, especially if it involves expensive hardware, such as HDMI output.

Feature	Symbian^3/Anna/Belle	Symbian^2	Symbian^1/Series 60 5th Edition	Series 60 3rd Edition Feature Pack 2	Series 80
Year released	2010 (Symbian^3), 2011 (Symbian Anna, Nokia Belle)	2010	2008	2008
Company	Symbian Foundation	Symbian Foundation	Symbian Foundation	Symbian Foundation	Symbian Foundation
Symbian OS version	9.5 (Symbian^3/Symbian Anna), 10.1 (Nokia Belle)		9.4	9.3
Series 60 version	5.2 (Symbian^3)	5.1	5th Edition	3rd Edition Feature Pack 2	N/A
Touch input support	Yes	Yes	Yes	No	No
Multi touch input support	Yes		No	No	No
Number of customizable home screens	Three to six (Five on Nokia E6, six on Nokia Belle)		One	Two	One
Wi-Fi version support	B, G, N		B, G	B, G	B, G
USB on the go support	Yes		No	No
DVB-H support	Yes, with extra headset	Un­known, but have 1seg support	Yes, with extra headset	Yes, with extra headset
Short range FM transmitter support	Yes		Yes	Yes	No
FM radio support	Yes		Yes	Yes	No
Feature	Symbian^3/Anna/Belle	Symbian^2	Symbian^1/Series 60 5th Edition	Series 60 3rd Edition Feature Pack 2	Series 80
Adobe Flash support	Yes, Flash Lite native version 4.0, upgradable		Yes, Flash Lite native version 3.1, upgradable	Yes, Flash Lite native version 3.1, upgradable	No
Microsoft Silverlight support	No		Yes	No	No
OpenGL ES support	Yes, version 2.0				No
SQLite support	Yes		Yes	Yes
CPU architecture support	ARM	SH-Mobile	ARM	ARM	ARM
Programmed in	C++, Qt		C++, Qt	C++, Qt
License	Eclipse Public License; Since March 31, 2011: Nokia Symbian License 1.0	proprietary SFL license, while some portions of source code are EPL licensed.
Public issues list	No more
Package manager	.sis, .sisx		.sis, .sisx	.sis, .sisx	.sis, .sisx
Non English languages support	Yes	mainly Japanese,	Yes	Yes	Yes
Underlining spell checker	Yes	Yes	Yes	Yes
Keeps state on shutdown or crash	No		No	No	No
Internal search	Yes	Yes	Yes	Yes	Yes
Proxy server	Yes		Yes	Yes	Yes
On-device encryption	Yes	Yes	Yes	Yes
Cut, copy, and paste support	Yes	Yes	Yes	Yes	Yes
Undo	No		No	No	Yes
Default Web Browser for S60, WebKit engine	version 7.2, engine version 525 (Symbian^3); version 7.3, engine version 533.4 (Symbian Anna)		version 7.1.4, engine version 525; version 7.3, engine version 533.4 (for 9 selected units after firmware updates released in summer 2011)	engine version 413 (Nokia N79)	N/A
third-party software store	Nokia store	i-αppli/i-Widget	Nokia store	Nokia store
Email sync protocol support	POP3, IMAP	i-mode mail	POP3, IMAP	POP3, IMAP	POP3, IMAP
Feature	Symbian^3/Anna/Belle	Symbian^2	Symbian^1/Series 60 5th Edition	Series 60 3rd Edition Feature Pack 2	Series 80
Push alerts	Yes		Yes	Yes	Yes
Voice recognition	Yes	Yes	Yes	Yes
Tethering	USB, Bluetooth; mobile Wi-Fi hotspot, with third-party software		USB, Bluetooth; mobile Wi-Fi hotspot, with third-party software	USB, Bluetooth; mobile Wi-Fi hotspot, with third-party software	USB, Bluetooth;
Text, document support	Mobile Office Applications, PDF	Mobile Office Applications, PDF	Mobile Office Applications, PDF	Mobile Office Applications, PDF	Mobile Office Applications, PDF
Audio playback	All	wma, aac	All	All	wav, mp3
Video playback	H.263, H.264, WMV, MPEG4, MPEG4@ HD 720p 25–30 frame/s, MKV, DivX, XviD	WMV, MPEG4	H.263, WMV, MPEG4, 3GPP, 3GPP2	H.263, WMV, MPEG4, 3GPP, 3GPP2	H.263, 3GPP, 3GPP2
Turn-by-turn GPS	Yes, with third-party software, or free global Nokia Nokia Maps which works offline	Yes, with monthly paid Docomo Map Navi (ドコモ地図ナビ)	Yes, with third-party software, or free global Nokia Nokia Maps which works offline	Yes, with third-party software, or free global Nokia Nokia Maps which works offline	Yes, with third-party software
Video out	Nokia AV, PAL, NTSC, HDMI	HDMI, and	Nokia AV, PAL, NTSC	Nokia AV, PAL, NTSC	No
Multitasking	Yes		Yes	Yes	Yes
Desktop interactive widgets	Yes	Yes	Yes	No
Integrated hardware keyboard	Yes	Yes	Yes	Yes	Yes
Bluetooth keyboard	Yes	Yes	Yes	Yes	Yes
Video conference front video camera	Yes	Yes	Yes	Yes	Yes
Can share data via Bluetooth with all devices	Yes	Yes	Yes	Yes	Yes
Skype, third-party software	Yes		Yes	Yes
Facebook IM chat	Yes		Yes	Yes
Secure Shell (SSH)	Yes, third-party software		Yes, third-party software	Yes, third-party software
OpenVPN	No, Nokia VPN can be used		No, Nokia VPN can be used	No, Nokia VPN can be used	Yes, third-party software
Remote frame buffer	?
Screenshot	Yes, third-party software		Yes, third-party software	Yes, third-party software	Yes
GPU acceleration	Yes				No
Official SDK platform(s)	Cross-platform, Windows (preferred is Qt), Carbide.c++, Java ME, Web Runtime Widgets (WRT), Flash lite, Python for Symbian		Cross-platform, Windows (preferred is Qt), Carbide.c++, Java ME, Web Runtime Widgets (WRT), Flash lite, Python for Symbian	Cross-platform, Windows (preferred is Qt), Carbide.c++, Java ME, Web Runtime Widget (WRT), Flash lite, Python for Symbian	Cross-platform, Windows (preferred is Qt), Carbide.c++, Java ME, third-party software (OPL)
Feature	Symbian^3/Anna/Belle	Symbian^2	Symbian^1/Series 60 5th Edition	Series 60 3rd Edition Feature Pack 2	Series 80
First device(s)	Nokia N8 (Symbian^3), Nokia C7 (Symbian^3), Nokia X7, Nokia E6 (Anna), Nokia 603, Nokia 700, Nokia 701 (Belle)	NTT DOCOMO STYLE Series F-07B	Nokia 5800 (October 2, 2008)	Nokia N96, Nokia N78, Nokia 6210 Navigator and Nokia 6220 Classic (February 11, 2008)	Nokia 9210
Devices	Nokia N8, Nokia C6-01, Nokia C7-00, Nokia E7-00, Nokia E6, Nokia X7, Nokia 500, Nokia 603, Nokia 700, Nokia 701, Nokia 808 PureView	NTT DoCoMo: F-06B*, F-07B*, F-08B*, SH-07B†, F-10B, Raku-Raku Phone 7, F-01C*, F-02C*, F-03C*, F-04C*, F-05C*, SH-01C†, SH-02C†, SH-04C†, SH-05C†, SH-06C†, Touch Wood SH-08C†	Nokia 5228, Nokia 5230, Nokia 5233, Nokia 5235, Nokia 5250, Nokia 5530 XpressMusic, Nokia 5800 XpressMusic, Nokia 5800 Navigation Edition, Nokia C5-03, Nokia C6-00, Nokia N97, Nokia N97 mini, Nokia X6, Samsung i8910 Omnia HD, Sony Ericsson Satio, Sony Ericsson Vivaz, Sony Ericsson Vivaz Pro	Nokia 5320 XpressMusic, Nokia 5630 XpressMusic, Nokia 5730 XpressMusic, Nokia 6210 Navigator, Nokia 6220 Classic, Nokia 6650 fold, Nokia 6710 Navigator, Nokia 6720 Classic, Nokia 6730 Classic, Nokia 6760 Slide, Nokia 6790 Surge, Nokia E5-00, Nokia E52, Nokia E55, Nokia E71, Nokia E72, Nokia E75, Nokia N78, Nokia N79, Nokia N85, Nokia N86 8MP, Nokia N96, Nokia X5, Samsung GT-i8510 (INNOV8), Samsung GT-I7110, Samsung SGH-L870, Nokia C5-00	Nokia 9210, Nokia 9300, Nokia 9300i, Nokia 9500
Feature	Symbian^3/Anna/Belle	Symbian^2	Symbian^1/Series 60 5th Edition	Series 60 3rd Edition Feature Pack 2	Series 80

* manufactured by Fujitsu
† manufactured by Sharp

Market share and competition

In the number of "smart mobile device" sales, Symbian devices were the market leaders for 2010. Statistics showed that Symbian devices formed a 37.6% share of smart mobile devices sold, with Android having 22.7%, RIM having 16%, and Apple having 15.7% (via iOS).

Prior reports on device shipments as published in February 2010 showed that the Symbian devices formed a 47.2% share of the smart mobile devices shipped in 2009, with RIM having 20.8%, Apple having 15.1% (via iOS), Microsoft having 8.8% (via Windows CE and Windows Mobile) and Android having 4.7%. Other competitors include webOS, Qualcomm's BREW, SavaJe, Linux and MontaVista Software.

Symbian has lost market share over the years as the market has dramatically grown, with new competing platforms entering the market, though it's sales have increased during the same timeframe. E.g., although Symbian's share of the global smartphone market dropped from 52.4% in 2008 to 47.2% in 2009, shipments of Symbian devices grew 4.8%, from 74.9 million units to 78.5 million units. From Q2 2009 to Q2 2010, shipments of Symbian devices grew 41.5%, by 8.0 million units, from 19,178,910 units to 27,129,340; compared to an increase of 9.6 million units for Android, 3.3 million units for RIM, and 3.2 million units for Apple. In 2006, Symbian had 73% of the smartphone market, compared with 22.1% of the market in the second quarter of 2011. Over the course of 2009–2011, Nokia, Motorola, Samsung, LG, and Sony Ericsson announced their withdrawal from Symbian in favour of alternative platforms including Google's Android, Microsoft's Windows Phone, and Samsung's bada.

Criticisms

The users of Symbian in the countries with non-Latin alphabets (such as Russia, Ukraine and others) have been criticizing the complicated method of language switching for many years. For example, if a user wants to type a Latin letter, he must call the menu, click the languages item, use arrow keys to choose, for example, the English language from among many other languages, and then press the 'OK' button. After typing the Latin letter, the user must repeat the procedure to return to his native keyboard. This method slows down typing significantly. In touch-phones and QWERTY phones the procedure is slightly different but remains time-consuming. All other mobile operating systems, as well as Nokia's S40 phones, enable switching between two initially selected languages by one click or a single gesture.

Early versions of the firmware for the original Nokia N97, running on Symbian^1/Series 60 5th Edition have been heavily criticized.

In November 2010, Smartphone blog All About Symbian criticized the performance of Symbian's default web browser and recommended the alternative browser Opera Mobile. Nokia's Senior Vice President Jo Harlow promised an updated browser in the first quarter of 2011.

Malware

Main article: Mobile virus

See also: Mobile security

Symbian OS was subject to a variety of viruses, the best known of which is Cabir. Usually these send themselves from phone to phone by Bluetooth. So far, none have taken advantage of any flaws in Symbian OS – instead, they have all asked the user whether they would like to install the software, with somewhat prominent warnings that it can't be trusted, although some rely on social engineering, often in the form of messages that come with the malware, purporting to be an utility, game or some other application for Symbian.

However, with a view that the average mobile phone user shouldn't have to worry about security, Symbian OS 9.x adopted a UNIX-style capability model (permissions per process, not per object). Installed software is theoretically unable to do damaging things (such as costing the user money by sending network data) without being digitally signed – thus making it traceable. Commercial developers who can afford the cost can apply to have their software signed via the Symbian Signed program. Developers also have the option of self-signing their programs. However, the set of available features does not include access to Bluetooth, IrDA, GSM CellID, voice calls, GPS and few others. Some operators have opted to disable all certificates other than the Symbian Signed certificates.

Some other hostile programs are listed below, but all of them still require the input of the user to run.

• Drever.A is a malicious SIS file trojan that attempts to disable the automatic startup from Simworks and Kaspersky Symbian Anti-Virus applications.
• Locknut.B is a malicious SIS file trojan that pretends to be a patch for Symbian S60 mobile phones. When installed, it drops a binary that will crash a critical system service component. This will prevent any application from being launched in the phone.
• Mabir.A is basically Cabir with added MMS functionality. The two are written by the same author, and the code shares many similarities. It spreads using Bluetooth via the same routine as early variants of Cabir. As Mabir.A activates it will search for the first phone it finds, and starts sending copies of itself to that phone.
• Fontal.A is an SIS file trojan that installs a corrupted file which causes the phone to fail at reboot. If the user tries to reboot the infected phone, it will be permanently stick on the reboot, and cannot be used without disinfection – that is, the use of the reformat key combination which causes the phone to lose all data. Being a trojan, Frontal cannot spread by itself – the most likely way for the user to get infected would be to acquire the file from untrusted sources, and then install it to the phone, inadvertently or otherwise.

A new form of malware threat to Symbian OS in form of 'cooked firmware' was recently demonstrated at the International Malware Conference, MalCon, December 2010, by Indian hacker Atul Alex.

Bypassing platform security

Symbian OS 9.x devices can be hacked to remove the platform security introduced in OS 9.1 onwards, allowing users to execute unsigned code. This allows altering system files, and access to previously locked areas of the OS. The hack was criticised by Nokia for potentially increasing the threat posed by mobile viruses as unsigned code can be executed.

See also

General

• EKA2 current Symbian kernel, successor of EKA1
• History of Symbian
• List of Symbian devices
• MOAP user interface
• Nokia Ovi suite
• Series60-Remote
• Nokia PC Suite, software package used to establish an interface between Nokia mobile devices and computers running Microsoft Windows operating system; not limited to Symbian
• Nokia Software Updater
• S60, Series 60, user interface used by Nokia and others
  • Web Browser for S60 default web browser
• Ovi store Nokia's application store on the Internet, not limited to Symbian
• Symbian Foundation
• Symbian Ltd.

Development-related

• Accredited Symbian Developer
• Active object (Symbian OS)
• Carbide.c++, alternative application and OS development IDE
• Cleanup stack
• P.I.P.S. Is POSIX on Symbian
• Python for S60, alternative application development language
• Qt (framework), preferred development tool, both for the OS and applications, not limited to Symbian
  • Qt Creator IDE
  • Qt Quick
  • QML, JavaScript based language

Symbian^3 EPL Source

• symbiandump
• wildducks

Applications

• See category:Symbian software (still very incomplete)

Bibliography

• Morris, Ben (22 June 2007). The Symbian OS architecture sourcebook : design and evolution of a mobile phone OS. John Wiley & Sons. p. 630. ISBN 0-470-01846-1.

External links

• Symbian foundation blog (which the homepage redirects to)
• Symbian on Ohloh
• Template:Dmoz
• Qt developer website
• Symbian C++ developer website