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 GoPhone. 1  Account number - you'll need to contact GoPhone customer service (611 from your mobile phone). 2  PIN number - Set up initially when you opened the account: if you don't remember if you'll need to contact customer service at 1-800-901-9878.