Definition of mandible. 1  1a : jaw 1a; especially : a lower jaw consisting of a single bone or of completely fused bonesb : the lower jaw with its investing soft partsc : either the upper or lower segment of the bill of a bird.
Using other AT&T Payment Options. 1  1. Pay your bill via the automated phone system. Dial 1-800-288-2020 to access the 24 hour-a-day telephone customer service system. 2  2. Speak with a customer service representative. Once you have verified your phone number, the phone system will ask you what you would like to do.
When you use an AT&T USADirectÂ® access number, you can bill your calls to an AT&T Calling Card, the AT&T Corporate Calling Card, an AT&T PrePaid Phone Card, many local phone company cards, and most major credit cards. Within the U.S. and Canada, the AT&T access number is 1-800-CALL-ATT Â®.