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.
AT&T GoPhone Prepaid Minutes Refill Instructions. 1  For GSM phones: PRESS *888* + (PIN Number) + # + SEND. 2  For TDMA phones: PRESS #20 + (PIN Number) + # + SEND.  Or, dial 611 (or 1-800-901-9878) from your wireless phone - a free call. Follow the instructions to add this card value to your account.