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: 1-866-424-8002. To pay your bill using our automated Pay by Phone system, dial 1-866-424-8002 and follow the prompts. You can pay using your checking, savings or debit/credit card account. Pay by Phone is available 24 hours a day, seven days a week, and can be used for personal, business and farm & ranch policies.