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AT&T

AT&T Inc., an abbreviation for its predecessor's former name, the American Telephone and Telegraph Company, is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's third largest telecommunications company by revenue and the third largest wireless carrier in the United States behind Verizon and T-Mobile. As of 2023, AT&T was ranked 32nd on the ''Fortune'' 500 rankings of the largest United States corporations, with revenues of $122.4 billion.

The modern company to bear the AT&T name began its history as the American District Telegraph Company, formed in St. Louis in 1878. After expanding services to Arkansas, Kansas, Oklahoma and Texas through a series of mergers, it became the Southwestern Bell Telephone Company in 1920. Southwestern Bell was a subsidiary of the original American Telephone & Telegraph Company, itself founded in 1885 as a subsidiary of the original Bell Telephone Company founded by Alexander Graham Bell in 1877. In 1899, AT&T became the parent company after the American Bell Telephone Company sold its assets to its subsidiary. During most of the 20th century, AT&T had a near monopoly on phone service in the United States through its Bell System of local operating companies. This led to AT&T's common nickname of "Ma Bell". The company was formally rebranded as AT&T Corporation in 1994.

The 1982 ''United States v. AT&T'' antitrust lawsuit resulted in the breakup of the Bell System, with AT&T giving up ownership of its local operating subsidiaries. The local companies were divested to seven Regional Bell Operating Companies (RBOCs), commonly called "Baby Bells", including Southwestern Bell Corporation (SBC). The latter changed its name to SBC Communications Inc. in 1995. SBC acquired fellow Baby Bells Pacific Telesis in 1997 and Ameritech in 1999.

In 2005, SBC purchased its former parent AT&T Corp. and took on the latter's branding, history, and stock trading symbol, as well as a version of its iconic logo. The merged entity, naming itself AT&T Inc., launched on December 30, 2005. The newly merged and renamed AT&T Inc. acquired BellSouth Corporation in 2006, the last independent Baby Bell, making the two companies' joint venture Cingular Wireless (which had itself acquired AT&T Wireless in 2004) a wholly owned subsidiary of AT&T Inc. Cingular was then rebranded as AT&T Mobility.

AT&T Inc. also acquired Time Warner in 2016, with the proposed merger confirmed on June 12, 2018 and the aim of making AT&T Inc. the largest and controlling shareholder of Time Warner, which it then rebranded as WarnerMedia in 2018. The company later withdrew its equity stake in WarnerMedia in 2022 and merged it with Discovery, Inc. to create Warner Bros. Discovery, divesting itself of its media arm.

The current AT&T reconstitutes most of the former Bell System, and includes four of the seven "Baby Bells" along with the original AT&T Corp., including the long-distance division. Provided by Wikipedia