AT&T

History

YearDetail
1876 Alexander Graham Bell invented the telephone. That was the foundation of the company that would become AT&T.
1984 Established Southwestern Bell Corp.
1997 Southwestern Bell Corp. acquired Pacific Telesis Group.
1999 Southwestern Bell Corp. acquired Ameritech Corp.
2005 Southwestern Bell Corp. acquired AT&T Corp.
2013 It bought Cricket Wireless LLC. 
2015 It completed purchase of 2 Mexican wireless companies, lusacell and Nextel in Mexico.