See also:

Reprogramming Universal Home Remote Buttons
Any of the three buttons can be reprogrammed by repeating the instructions. ...

Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
To assist customers who are deaf, hard of hearing, or speech impaired and who use Text Telephones (TTYs), GMC has TTY equipment available at its Customer Assistance Center. Any TTY user can communicat ...

Call Waiting
Call waiting must be supported on the cell phone and enabled by the wireless service carrier. ○ Press to answer an incoming call when another call is active. The original call is placed on ...