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2. Illinois Bell - Wikipedia

   en.wikipedia.org/wiki/Illinois_Bell

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

3. Ameritech - Wikipedia

   en.wikipedia.org/wiki/Ameritech

   Ameritech. 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 created following the breakup of the Bell System.

4. Franklin Center (Chicago) - Wikipedia

   en.wikipedia.org/wiki/Franklin_Center_(Chicago)

   The Franklin Center is a 60-story supertall skyscraper in the Loop neighborhood of downtown Chicago. Completed in 1989 as the AT&T Corporate Center to consolidate the central region headquarters of the American Telephone & Telegraph Company (AT&T), [2] it stands at a height of 1,007 ft (307 m) and contains 1.7 million sq ft (160,000 m 2) of ...

5. Cellular One - Wikipedia

   en.wikipedia.org/wiki/Cellular_One

   Cellular One. Cellular One is the trademarked brand name that licenses services (radio frequencies for telecommunications) used by several cellular service providers in the United States. The brand was sold to Trilogy Partners by AT&T in 2008 shortly after AT&T had completed its acquisition of Dobson Communications.

6. Southwestern Bell - Wikipedia

   en.wikipedia.org/wiki/Southwestern_Bell

   Southwestern Bell Telephone Company is a wholly owned subsidiary of AT&T. It does business as other d.b.a. names in its operating region, which includes Arkansas, Kansas, Missouri, Oklahoma, Texas, and portions of Illinois. The company is currently headquartered in Dallas, Texas at One AT&T Plaza .

7. Ameritech Cellular - Wikipedia

   en.wikipedia.org/wiki/Ameritech_Cellular

   Ameritech Mobile Communications, LLC was the first company in the United States to provide cellular mobile phone service to the general public. Cell service became publicly available in Chicago on October 13, 1983. The company was a division of Ameritech which, as of January 1, 1984, was the holding company of Illinois Bell, Michigan Bell ...