MassRelay TTY and ASCII
How to request
To start, you can call (800) 439-2370. For Spanish, you can call (866) 930-9252.
Once connected with a relay operator, you should be prompted with "NUMBERS PLS GA" meaning the operator is ready for you to input the phone number that you'd like to call. To indicate that you're done typing, be sure to write "GA" which means "go ahead".