Ameritech
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Illinois Bell Telephone Company, LLC is the Bell Operating Company serving Illinois. It is owned by AT&T through AT&T Teleholdings, formerly Ameritech . Their headquarters are at 225 West Randolph St., Chicago, IL.
Illinois Bell Telephone Company is the legal name of what has generally been known as Ameritech Illinois since 1993. The firm is the largest provider of local telephone service in the state, and recently has been at the forefront of new technologies such as fiber optics and digital switching.
Learn about the history of Illinois Bell Telephone Co., a phone company that served the Chicago area from 1878 to 2000. Find out how it evolved from a local company to a regional and national giant, and how it changed after the breakup of AT&T.
- Illinois Bell Telephone Co.
The Bell Telephone Company was the initial corporate entity from which the Bell System originated to build a continental conglomerate and monopoly in telecommunication services in the United States and Canada.
Learn about the history of telephony in Chicago, from the invention of the telephone by Alexander Graham Bell to the breakup of AT&T in 1984. Find out how Illinois Bell, a Bell System company, became part of SBC Communications in 1999.
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.
Illinois Bell Telephone Company is the legal name of what has generally been known as Ameritech Illinois since 1993. The firm is the largest provider of local telephone service in the state, and recently has been at the forefront of new technologies such as fiber optics and digital switching.
