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.
AT&T reserves the right to interrupt service if payment is not made on-time. A service fee will be charged to resume cell phone connectivity after payment is made. I Canât Make a Payment. AT&T offers payment arrangements to help consumers pay outstanding cell phone bills. To set up a payment arrangement, customers can call 1-800-947-5096. Customers are eligible for payment arrangements if they have been with AT&T for more than 6 months without interruption. If you break a payment arrangement, AT&T will not allow you to use the service again for 3 months.