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 Cingular Wireless)
AT&T Wireless Services, the former wireless provider subsidiary that became part of 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 (formerly also called Bell Telephone Laboratories, Inc., and later 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
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