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.
AT&T is famous for communication services. AT&T's products include wireless voice and data, broadband internet, video, and data, and long distance phone service. AT&T is one of the premier wireless providers for smart phones in the US.AT&T's main competitor is Verizon.AT&T's toll-free customer service number is 1-800-331-0500 for wireless services.T&T's products include wireless voice and data, broadband internet, video, and data, and long distance phone service. AT&T is one of the premier wireless providers for smart phones in the US. AT&T's main competitor is Verizon. AT&T's toll-free customer service number is 1-800-331-0500 for wireless services.