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.
Other carriers have different addresses -you can use these to send an email from your computer and it will arrive as a text message on that person's phone. AT&T (formerly Cingular) [10-digit phone number]@txt.att.net. [10-digit phone number]@mms.att.net (MMS)