智能手机
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智能手机是一种在手机内安装了相应开放式操作系统的手机，至2008年底约有4.5亿部。通常使用的操作系统有：Symbian、Windows Mobile、Linux和Palm。另外,也有较少人使用的Android和BlackBerry。他们之间的应用软件互不兼容。因为可以安装第三方软件，所以智能手机有丰富的功能。
定义
在软件上由于Symbian操作系统的手机在整个中国智能手机市场份额所占最多，因此基于Symbian操作系统的软件也非常丰富。Windows Mobile的应用也很丰富，近些年随着Windows Mobile的市场份额的上升，基于Windows Mobile应用也在迅速增加。Palm上也有非常丰富的应用软件。Linux上的第三方软件目前还比较少。
采用Symbian操作系统的手机多为诺基亚和索尼爱立信生产。采用Windows Mobile操作系统的手机包括HTC （Dopod，Qtek） 等，以及Mio生产的带有GPS功能的手机。采用Palm操作系统的手机包括HandSpring（与Palm合并）的Treo系列，以及香港生产商GSL的Xplore系列。采用Linux操作系统的手机有MOTO的E680，海尔的N60，飞利浦的968等。
智能手机可以是传统的手机增加智能功能，比如Symbian操作系统的S60系列、Windows Mobile操作系统的Windows Mobile Smartphone系列; 也可以是传统PDA加上手机通信功能，比如Windows Mobile操作系统的Windows Mobile Pocket PC Phone系列、Palm操作系统的Treo系列; 也可是其它独立类型，比如Symbian操作系统的S80、UIQ，以及一些Linux操作系统的智能手机。然而，就新近的发展来看，这些智能手机的类型有相融合的趋势。
智能手机有别普通带触摸屏的手机。一般普通带触摸屏的手机都使用的是生产厂商自行开发的封闭式操作系统，所能实现的功能非常有限。
“智能手机（Smart Phone）”这个说法主要是针对“功能手机（Feature phone）”而来的，本身并不意味着这个手机有多“智能（Smart）”；从另一个角度来讲，所谓的“智能手机（Smart Phone）”就是一台可以随意安装和卸载应用软件的手机（就像电脑那样）。（“功能手机（Feature phone）”是不能随意安装卸载软件的，JAVA的出现使后来的“功能手机（Feature phone）”具备了安装JAVA应用程序的功能，但是JAVA程序的操作友好性，运行效率及对系统资源的操作都比“智能手机（Smart Phone）”差很多。）[1]
智能手机操作系统
智能手机上可以找到的操作系统包括Symbian OS，RIM的BlackBerry ， Windows Mobile，Linux， Palm OS，和iPhone OS。Android是谷歌和T-Mobile公司最新推出的智能系统 。
Symbian OS
iPhone OS
The iPhone and iPod Touch use an operating system called iPhone OS, which is derived from Mac OS X. Third party applications were not officially supported until the release of iPhone OS 2.0 on July 11th 2008. Before this,"jailbreaking" allowed third party applications to be installed, and this method is still available.
黑莓(BlackBerry)
此操作系统将重点放在操作简便及为商务使用而设计。目前因为第三方软体的激增，而增进了多媒体的功能。
Windows Mobile
The Windows CE operating system and Windows Mobile middleware are widely spread in Asia. The two improved variants of this operating system, Windows Mobile 6 Professional (for touch screen devices) and Windows Mobile 6 Standard, were unveiled in February 2007. Windows Mobile is enjoying great popularity because of the low barrier to entry for third-party developers to write new applications for the platform.
Linux
Linux is strongest in China where it is used by Motorola, and in Japan, used by DoCoMo. Rather than being a platform in its own right, Linux is used as a basis for a number of different platforms developed by several vendors, including Motorola and TrollTech, which are mostly incompatible. PalmSource (now Access) is moving towards an interface running on Linux.[ Another platform based on Linux is being developed by Motorola, NEC, NTT DoCoMo, Panasonic, Samsung, and Vodafone.
Palm OS
PalmSource traditionally used its own platform developed by Palm Inc. Access Linux Platform (ALP) is an improvement that was planned to be launched in the first half of 2007. It will use technical specifications from the Linux Phone Standards Forum. The Access Linux Platform will include an emulation layer to support applications developed for Palm-based devices.
Android
Android, which was developed by Google, has yet to own even a small part of the smartphone market because of its recent release date. The OS is currently only on the HTC Dream (G1), running on T-Mobile USA's network. Android was developed as a platform that could be run on many devices. Although the Android operating system may be built to run on many devices, it is run exclusively on T-Mobile's G1 at the moment. Sprint also plans to sell an Android powered phone sometime in February or March of 2009.