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.
If you receive your phone bill from AT&T and wish to make a payment arrangement, please call the AT&T Credit and Accounts Receivable Management Center at 1-800-532-7486. If your AT&T Long Distance charges are included in the bill you receive from your local phone company, you will need to contact the company directly.