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.
800-288-2020 AT&T U-Verse Customer Service Number. Phone Numbers - United States. Feel free to dial 800-288-2020, for AT&T U-Verse customer support, and have answers to all those problematic questions rising in your mind. 800-288-2020 is a AT&T U-Verse customer support hotline easily accessible to you round the clock 24/7.