The Baby Bell Phone Co. is a term used to refer to the seven regional telephone companies that were created from the breakup of AT&T in 1984. The seven companies are NYNEX, Bell Atlantic, Ameritech, Pacific Telesis, Southwestern Bell, US West, and BellSouth. NYNEX was one of the seven regional telephone companies that were created from the breakup of AT&T in 1984. It served customers in New York, New England, and parts of Pennsylvania.