Wasn't it in the late 90's or early 2000's Cingular wireless acquired AT&T and they went with the name AT&T because the name was bigger.
Cingular bought AT&T Wireless, but AT&T used to be SBC, which used to be Southwestern Bell, which used to be one of the baby bells after the breakup of Ma bell, which used to be AT&T. Stop here and do not loop.

