In October 1988, Whitacre became president and chief operating officer of a regional bell operating company, Southwestern Bell Corporation. Two years later, Whitacre became chairman of the board and chief executive officer. In 1995, Southwestern Bell Corporation changed its name to SBC Communications. Whitacre led SBC through a series of mergers and acquisitions in building the largest provider of both local long distance telephone services and wireless service (through its Cingular division) in the United States. These acquisitions included Pacific Telesis (1997), SNET (1998), Comcast Cellular (1999), Ameritech (1999) and AT&T Corporation (2005), from which the post-merger company took its name, as well as the 2006 acquisition of Bell South.