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.
Technical support and customer service telephone numbers for AT&T High Speed Internet. 1  To verify status of a pending high speed Internet order.2  1-877-722-3755. 3  Existing member and would like customer service or technical support. 4  1-877-722-3755.5  For business accounts.T&T Technical Support. Technical support and customer service telephone numbers for AT&T High Speed Internet. 1  To verify status of a pending high speed Internet order. 2  1-877-722-3755. 3  Existing member and would like customer service or technical support.