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.
The due date of your payment is found on page 1 of your bill. How can I make payment arrangements for my balance? If you receive your phone bill from AT&T and wish to make a payment arrangement, please call the AT&T Credit and Accounts Receivable Management Center at 1-800-532-7486. If your AT&T Long Distance charges are included in the bill you receive from your local phone company, you will need to contact the company directly.