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  1. 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.

  2. 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.

  3. After federal courts dismantled AT&T's Bell system in 1984, Illinois Bell became the largest division of Ameritech, the new, leading telecommunications company in the Midwest. At the end of the 1990s, when it employed about 20,000 people in the Chicago area and collected nearly $20 billion in annual revenues, Ameritech was purchased by SBC ...

  4. 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.

  5. Learn about the history and services of Illinois Bell, the largest local telephone provider in Illinois. Find out how it evolved from a Chicago-based company to a statewide utility and a subsidiary of Ameritech Corporation.

  6. 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.

  7. Oct 9, 2013 · Learn how telephones changed Chicago from 1893 to present, including the role of Illinois Bell and area codes. See photos and sources of Chicago telephone history booklist.