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Illinois Bell Telephone Company, LLC

Company type	Subsidiary
Industry	Telecommunications
Founded	1881; 143 years ago (1881)
Headquarters	Chicago, Illinois, United States
Area served	Illinois, Indiana
Key people	Paul La Schiazza (president)
Products	Local Telephone Service
Parent	American Bell (1881-1899) AT&T Corporation (1899-1983) Ameritech (1984-1999) AT&T Inc. (1999-present)
Website	http://www.att.com

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. After the 1984 Bell System Divestiture, Illinois Bell became a part of Ameritech, one of the 7 original Regional Bell Operating Companies. The Illinois Bell name continued to be used until January 1993, when Ameritech dropped all of their individual Bell Operating Company names in favor of using their corporate name, Ameritech, for marketing purposes. Illinois Bell started doing business as Ameritech Illinois.

Illinois Bell, in 1971, became the first ever telephone company to offer Call waiting, Three-way calling, Speed Calling, and Call forwarding, all popular local exchange carrier telephone service options to this day.

In 1997, Illinois Bell acquired lines in the Chicago metro area from Central Telephone Company of Illinois, a Sprint company.

In 1998, Ameritech announced intentions to merge with SBC, another former RBOC. Though the merger wasn't well received at first, it was allowed to occur with some conditions. The two companies were officially merged as of October 8, 1999. The Ameritech name continued to be used until 2002, despite the merger.

In 2001, the company started doing business as SBC Ameritech Illinois.

In 2002, SBC dropped the Ameritech name in favor of "SBC" as a national brand. On January 1, 2003, Illinois Bell, for regulatory business, was renamed Illinois Bell Telephone Company d/b/a SBC Illinois. Illinois Bell's trade name was changed once again in 2006, following conclusion of SBC Communications' purchase of AT&T, to Illinois Bell Telephone Company d/b/a AT&T Illinois.

v t e Bell System
Parent company American Telephone and Telegraph Company
Local telephone companies still extant Wholly owned Bell Telephone Company of Nevada The Bell Telephone Company of Pennsylvania The Chesapeake & Potomac Telephone Company The Chesapeake & Potomac Telephone Company of Maryland The Chesapeake & Potomac Telephone Company of West Virginia The Chesapeake & Potomac Telephone Company of Virginia Diamond State Telephone Illinois Bell Indiana Bell Michigan Bell Mountain Bell New England Telephone New Jersey Bell New York Telephone Northwestern Bell Ohio Bell Pacific Northwest Bell Pacific Telephone South Central Bell Southern Bell Southwestern Bell Wisconsin Telephone Partially owned Southern New England Telephone Cincinnati Bell
Other subsidiaries Manufacturing Western Electric Research Bell Labs Long distance Long Lines Wireless Advanced Mobile Phone Service Regional Bell companies Bell Canada (1880-1975)
Historical Commemorative Alexander Graham Bell National Historic Site Bell Boatyard Bell Homestead National Historic Site Bell Telephone Memorial Telephone Pioneers of America Spirit of Communication Defunct Bell Telephone Company New England Telephone and Telegraph Company International Bell Telephone Company The Bell Telephone Company of Canada Northern Electric Bell Telephone Manufacturing Company AT&T Technologies, Inc.
Related topics Divestiture Regional Bell Operating Company
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