AT&T (disambiguation)

AT&T Inc. is a U.S. telecommunications firm founded 1983 (formerly Southwestern Bell or SBC Communications).

AT&T may also refer to:

Telecommunications

AT&T Corporation, the original AT&T founded 1885 (formerly American Telephone & Telegraph), purchased by SBC in 2005
- AT&T Information Systems, founded 1982 (formerly American Bell), an unregulated business subsidiary of AT&T Corp.
- Alascom dba AT&T Alascom, founded 1900 (formerly Washington-Alaska Military Cable and Telegraph System), a long-distance company
AT&T Labs, founded 1988 (formerly Southwestern Bell Technology Resources), the R&D division of AT&T Inc.
- AT&T Laboratories, founded 1925 as part of Bell Labs and AT&T Corp., later spun off and now absorbed into AT&T Labs
AT&T Communications (formerly AT&T Long Lines), an operating company serving the regions of the Bell Operating Companies
- AT&T CallVantage, a voice-over-internet-protocol service formerly offered by AT&T Corp. and then AT&T Inc.
AT&T Mobility, the wireless provider subsidiary of AT&T Inc. (formerly AT&T Wireless or Cingular Wireless)
AT&T Technologies, founded 1983, a telephone producer, the postdivestiture successor to Western Electric
AT&T Broadband, founded 1999 (now part of Comcast), once the largest U.S. provider of cable television services
Advanced American Telephones, founded 1983, a manufacturer of AT&T branded phones (formerly AT&T Consumer Products)
Bell Labs, founded 1925 (also called AT&T Bell Laboratories), a Nobel-Prize-winning research and development organization
Lucent, founded 1983 (now part of Alcatel-Lucent), the primary successor to Bell Labs and AT&T Technologies