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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 .
In 1984, the former AT&T agreed to divest its local telephone operations but retain its long distance, R&D and manufacturing arms. From this, SBC Communications Inc. (first known as Southwestern Bell Corp.) was born. Twelve years later, the Telecommunications Act of 1996 drove major changes in the competitive landscape.
Statistics: Public Company. Incorporated: 1920 as Southwestern Bell Telephone Company. Employees: 203,000. Sales: $46 billion (1998) Stock Exchanges: New York. Ticker Symbol: SBC. NAIC: 513310 Wired Telecommunications Carriers; 513322 Cellular and Other Wireless Telecommunica-tions; 511140 Telephone Directory Publishers.
Southwestern Bell Corporation (SBC) is one of the seven regional holding companies formed after the breakup of American Telephone & Telegraph Corporation ’ s (AT&T) Bell System in 1983.
Southwestern Bell Corporation. US West. The breakup of the Bell System was mandated on January 8, 1982, by a consent decree providing that AT&T Corporation would, as had been initially proposed by AT&T, relinquish control of the Bell Operating Companies, which had provided local telephone service in the United States. 
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AT&T Inc. (formerly SBC Communications, Inc.) is the parent company for BellSouth Corporation, Southwestern Bell Telephone Company, Pacific Telesis Group, Ameritech , and Southern New England Telephone.
The Foundations of Mobile and Cellular Telephony. A Southwestern Bell foreman testing mobile telephone service, St. Louis, 1946 (Courtesy AT&T Archives and History Center.) Dave Meilhan, the first cellular telephone customer in Chicago, makes a call from his car phone, 1983. (Courtesy AT&T Archives and History Center.)
Southwestern Bell Mobile Systems, Inc. was a wireless telephone company. It was created in 1984 as a split-off of Advanced Mobile Phone Service, the original wireless subsidiary of the Bell System. It was a division of Southwestern Bell Corporation .