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.
WELCOME TO ATT EMAIL SUPPORT. CALL : 1-800-259-1237 (TOLL FREE) AT&T, also well known as American Telephone and Telegraph company, is the 23rd largest American multinational telecommunications corporation in this world and it is also world largest mobile phone provider, operating globally under the AT&T brand.