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.
Over the Phone. You can use your credit card or checking account to pay your AT&T bill by phone using our automated system. To pay your bill by phone, please call 1-800-222-0300. Select Billing and follow the instructions To pay your bill by check or credit card from our touch tone menu.Pay by phone is available to AT&T Paper Billed customers at no additional charge from AT&T.o pay your AT&T bill by mail, simply include your check or money order with the payment slip and return in the envelope provided. If you misplace the payment slip, please send your payment to: AT&TPO Box 8212Aurora, IL 60572-8212. Be sure to include your account number on your check or money order.