What's SMS? I am trying to do this independently and not rely on someone to take messages for me.
I knew that relay could listen to your voice mail, but the main phone with the voice mail is a cordless phone. I can't use it to place it on my tty. I can't have another phone (doesn't have voice mail) in the same area as the main phone because there isn't an extra telephone plug to plug another phone to try to listen to the voice mail using tty relay.
I once had a phone with a voice mail, and the voicemail would not play while the phone was in use (while I used my tty).
I have to find out if the main cordless phone can be used to have a code set up to be punched in from another phone to listen to voice mail outside of home. I think it doesn't have that like the previous phone did. This phone voice mail is not good. It's hard for anyone to hear easily.