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 Phone Numbers. Whether youâre a residential customer, a business customer, or a new customer, youâve come to the right place. From here, you can find all the AT&T phone numbers to order or upgrade service, transfer service, or contact customer support. Thanks for your interest in contacting AT&T! Call 1-866-210-1770.