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2. Illinois Bell - Wikipedia

   en.wikipedia.org/wiki/Illinois_Bell

   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.

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 that was created following the breakup of the Bell ...

4. 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 ...

5. Southwestern Bell - Wikipedia

   en.wikipedia.org/wiki/Southwestern_Bell

   Southwestern Bell Telephone Company. 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 .

6. AT&T Mobility - Wikipedia

   en.wikipedia.org/wiki/AT&T_Mobility

   AT&T Mobility. AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the largest wireless carrier in the United States, with 241.5 million subscribers as of December ...

7. History of AT&T - Wikipedia

   en.wikipedia.org/wiki/History_of_AT&T

   History of AT&T. The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885 ...