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.
Pay by phone: You can pay your AT&T bill by phone by calling 1-800-331-0500 or 611. There may be a processing fee for paying your bill by phone. To make a payment without a fee dial *729 from your mobile phone. At the prompt, press the number 1 on your phone to pay with a bank account or 2 to pay by credit card. Enter payment information and wait for the confirmation number. Pay by text: AT&T offers the TXT-2-PAY service to all customers. The service must be set-up from your online account.