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 Customer Service Phone Numbers. Residential: 1-800-308-4156 Products & Services. 1-800-244-4444 General Assistance (Billing) 1-800-621-4533 Bilingual (Spanish) 1-800-611-4466 Repair.