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.
Hang up and call the phone number on your account statement, in the phone book, or on the companyâs or government agencyâs website to find out if the entity that supposedly contacted you actually needs the requested information from you. Contact AT&T at 1.800.337.5373, option 1 to report such activity.f a chargeback request has been completed and there are additional disputes of charges pertaining to an AT&T wireless account, contact the Global Fraud Management Organization at 877.844.5584. If the charges pertain to an AT&T wireline or U-verse accounts, contact AT&T Customer Care at 800.288.2020.