Definition of derived. biology. : being, possessing, or marked by a character (as the large brain in humans) not present in the ancestral form derived features.
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.
AUS (Toll Free) 1-800-360-519. AT&T Customer Support Number. ATT Inc. is an American multinational telecommunications located in Whitacre Tower, downtown Dallas, Texas. It is the major provider both of mobile telephony and of fixed telephony in the USA, and also provides television services, broadband subscription.