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  2. AT&T Michigan Headquarters - Wikipedia

    en.wikipedia.org/wiki/AT&T_Michigan_Headquarters

    The AT&T Building (formerly known as the SBC Building, the Ameritech Building and the Michigan Bell Building) was completed for the Michigan Bell Telephone Company in 1919 [1] and expanded in 1928. It is located at 1365 Cass Avenue, and occupies the block bordered by First Street, Cass Avenue, State Street, and Michigan Avenue .

  3. History of AT&T - Wikipedia

    en.wikipedia.org/wiki/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, which acquired the ...

  4. Area code 269 - Wikipedia

    en.wikipedia.org/wiki/Area_code_269

    Area code 269 is the telephone area code serving the southwest portion of Michigan's Lower Peninsula. [1] ... Frontier and AT&T are the predominant local telephone ...

  5. Michigan Bell - Wikipedia

    en.wikipedia.org/wiki/Michigan_Bell

    Michigan Bell is the subsidiary of AT&T serving the state of Michigan. Following the Bell System divestiture on January 8, 1984, the company became a subsidiary of Ameritech, the Regional Bell operating company that served the midwestern United States. Ameritech was subsequently acquired by SBC Communications, which later changed its name to AT&T.

  6. List of Michigan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Michigan_area_codes

    List of Michigan area codes. This is a list of telephone area codes in the U.S. state of Michigan: 231 – Northwestern Lower Michigan: Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan. 248 – Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township; overlays with area code 947.

  7. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.

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