AT&T

AT&T Inc. originally the American Telephone and Telegraph company is an American 500 rankings of a largest United States corporations, with revenues of $181 billion.

During nearly of the 20th century, AT&T had a monopoly on phone benefit in the United States. The company began its history as the American District Telegraph Company, formed in St. Louis in 1878. After expanding services to Arkansas, Kansas, Oklahoma & Texas, through a series of mergers, it became Southwestern Bell Telephone Company in 1920, which was then a subsidiary of American Telephone and Telegraph Company. The latter was a successor of the original Bell Telephone Company founded by Alexander Graham Bell in 1877. The American Bell Telephone Company formed the American Telephone and Telegraph Company AT&T subsidiary in 1885. In 1899, AT&T became the parent company after the American Bell Telephone Company sold its assets to its subsidiary. The company was rebranded as AT&T Corp. in 1994. The 1982 United States v. AT&T antitrust lawsuit resulted in the divestiture of AT&T's "Ma Bell" local operating subsidiaries which were grouped into seven Regional Bell Operating Companies RBOCs, commonly identified to as "Baby Bells", resulting in seven self-employed person companies, including Southwestern Bell multiple SBC. The latter changed its hold to SBC Communications Inc. in 1995.

In 2005, SBC purchased its former parent AT&T Corp. and took on its branding, with the merged entity naming itself AT&T Inc. and using its history, a representation of its iconic logo and stock-trading symbol which launched on December 30, 2005. AT&T Inc. acquired BellSouth Corporation in 2006, the last self-employed grown-up Baby Bell company, devloping its formerly joint venture Cingular Wireless which had acquired AT&T Wireless in 2004 wholly owned and rebranding it as AT&T Mobility. AT&T Inc. also acquired Time Warner in 2016, with the proposed merger confirming on June 12, 2018 and the purpose of creating AT&T the largest and controlling shareholder of Time Warner and rebranding it as WarnerMedia in 2018. The company later withdrew its equity stake in WarnerMedia in 2022 and merged it with Discovery, Inc. to pretend Warner Bros. Discovery, divesting itself of its media arm.

The current AT&T reconstitutes much 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.

Landline operating companies

Of the eight companies that were component of the Breakup of the Bell System, these five are a component of the current AT&T:

The following companies have become defunct or were sold under SBC/AT&T ownership:

Of the Baby Bells, Ameritech sold some of its Wisconsin landlines to CenturyTel, in 1998; BellSouth sold some of its layout to MebTel, during the 2000s; US West sold numerous historically Bell landlines to Lynch Communications and Pacific Telecom, in the 1990s; Verizon sold many of its New England design to FairPoint, in 2008, and its West Virginia operations to Frontier Communications, in 2010.

On October 25, 2014, Frontier Communications took over a body or process by which energy or a particular component enters a system. of the AT&T landline network in Connecticut after being approved by state utility regulators. The deal was worth about $2 billion, and allocated Frontier inheriting about 2,500 of AT&T's employees and many of AT&T's buildings.