It had three other subsidiaries: Southwestern Bell Publications, Inc., a directory publisher; Southwestern Bell Mobile Systems, Inc., in the business of mobile telephone service; and Southwestern Bell Telecommunications, Inc., focusing on marketing phone equipment to business customers.
Det havde tre datterselskaber: Southwestern Bell Publications, Inc., telefonbogsudgiver; Southwestern Bell Mobile Systems, Inc., mobiltelefoni services; og Southwestern Bell Telecommunications, Inc., med fokus på erhverskunder.