AT&T to replace Cingular brand Monday.

"AT&T Wireless was once an independent company that had been spun off from AT&T Corp. Cingular Wireless bought the wireless operator and eliminated the AT&T Wireless brand. Then SBC, one of the owners of Cingular, bought AT&T, adopting the AT&T brand for its landline services. More recently, AT&T bought BellSouth, the other owner of Cingular, spurring the switch back to the AT&T brand for the wireless service."