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AT&T Teleholdings, Inc., formerly known as Ameritech Corporation (and before that American Information Technologies Corporation), is an American telecommunications company that arose out of the 1984 AT&T divestiture. Ameritech was one of the seven Regional Bell Operating Companies that was created following the breakup of the Bell System. Ameritech was acquired in 1999 by SBC Communications, which subsequently acquired AT&T Corporation in 2006, becoming the present-day AT&T. Ameritech was created as a holding company that owned five former Bell System companies in the Midwest. Under its umbrella were: Illinois Bell Telephone Company Indiana Bell Telephone Company, Inc. Michigan Bell Telephone Company Ohio Bell Telephone Company Wisconsin Bell, Inc. For Ameritech's first nine years, it maintained these Bell brands inherited from the Bell System—though public displays of the Bell companies' names were often captioned "An Ameritech Company". In January 1993, Ameritech officially retired the Bell brands and marketed itself with solely the Ameritech name across all five states in its territory. It added "d/b/a Ameritech (state)" to the names of its Bells to communicate brand unity. Ameritech also owned Ameritech Cellular, a wireless company that operated cellular networks in many of the major cities of these states. Ameritech Cellular was previously called Ameritech Mobile Communications. Ameritech also provided cable television service in select areas as part of the Americast venture with other phone companies during the 1990s. Ameritech Advanced Data Services (AADS) Network Access Point (NAP) was one of the original four National Science Foundation exchange points in the United States starting in 1994. AADS was a Tier 1 network Internet Exchange Point in Chicago, Illinois that provided service to higher education and research networks via a program called Star TAP and commercial networks. After the merger with SBC, AADS did business as the SBC Network Access Point or SBC/AADS NAP.

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Related concepts (4)

AT&T

AT&T Inc. 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 largest provider of mobile telephone services in the U.S. , AT&T was ranked 13th on the Fortune 500 rankings of the largest United States corporations, with revenues of $120.7 billion. During most of the 20th century, AT&T had a monopoly on phone service in the United States.

Bell System

The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company (AT&T), that dominated the telephone services industry in North America for over 100 years from its creation in 1877 until its antitrust breakup in 1983. The system of companies was often colloquially called Ma Bell (as in "Mother Bell"), as it held a vertical monopoly over telecommunication products and services in most areas of the United States and Canada.

Breakup of the Bell System

The breakup of the Bell System was mandated on January 8, 1982, by a consent decree providing that AT&T Corporation would, as had been initially proposed by AT&T, relinquish control of the Bell Operating Companies, which had provided local telephone service in the United States. This effectively took the monopoly that was the Bell System and split it into entirely separate companies that would continue to provide telephone service.