If it had received government and regulatory approval, AT&T would have had more than 130 million subscribers. On March 20, 2011, AT&T Mobility announced its intention to acquire T-Mobile US from Deutsche Telekom for $39 billion. The transition concluded in late June, just prior to the rollout of the Apple iPhone. Although the legal corporate name change occurred immediately, for both regulatory and brand-awareness reasons both brands were used in the company's signage and advertising during a transition period. In January 2007, Cingular confirmed it would rebrand itself under the AT&T name. Cingular became wholly owned by AT&T in December 2006 as a result of AT&T's acquisition of BellSouth. Originally known as Cingular Wireless (a joint venture between SBC Communications and BellSouth) from 2000 to 2007, the company acquired the old AT&T Wireless in 2004 SBC later acquired the original AT&T and adopted its name.

The company is headquartered in Brookhaven, Georgia. AT&T Mobility is the third-largest wireless carrier in the United States, with 100.6 million subscribers as of the end of Q4 2021. and provides wireless services in the United States. It is a wholly owned subsidiary of AT&T Inc. AT&T Mobility LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company.

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