at&t Wireless

AT&T Mobility LLC is the wholly owned wireless subsidiary of AT&T Inc. AT&T Mobility, headquartered in Atlanta, Georgia, is the second largest mobile phone company, in terms of number of subscribers, under Verizon Wireless. AT&T Mobility has approximately 78.2 million subscribers as of the first quarter 2009.

Formerly a joint venture between SBC Communications and BellSouth, Cingular Wireless soon acquired the old AT&T Wireless; SBC later acquired the original AT&T and re-branded as "the new AT&T". Cingular became wholly-owned by the new AT&T in December 2006 as a result of AT&T's acquisition of BellSouth.

In January 2007, Cingular confirmed it would rebrand itself under the AT&T moniker. The corporate name change occurred immediately, although, for regulatory and brand-awareness reasons, both brands were used in the wireless unit's signage and advertising during a transition period. The transition concluded in late June, just prior to the rollout of the Apple iPhone.

Among the services that AT&T aggressively promotes is its "Rollover" service, allowing customers to keep unused minutes from month to month on a twelve-month rolling cycle on its popular "Nation" nationwide plans. Beginning in July 2007, AT&T now allows its AT&T Unity plan users to have "Rollover", a service which was exclusive to the "Nation" plans. AT&T also launched video share in 2007, in which a mobile caller can stream live video from one phone to another over the 3G network with video share capable phones. This allows one mobile phone user to view another's camera through the mobile phone in real time.

A large number of AT&T Mobility employees are unionized, belonging to the Communications Workers of America. The CWA represented roughly 15,000 of the previous 20,000 formerly AT&T Wireless employees as of early 2006.As of the end of 2007, the CWA website claims roughly 40,000 workers of AT&T Mobility are represented by the union.