First, decide which call option suits your needs:
If your speech isn't clear but you want to use your own voice or a voice output device
Speak and Listen calls are for people who can use their own voice or output device, but may be hard to understand on the phone. These calls allow you to speak and listen directly to the other person and use an ordinary phone.
Note that Speak and Listen calls through the NRS app provide the option of sending and receiving text along with the voice call.
If you can't speak but can type and hear
Type and Listen calls allow you to type what you want to say on a TTY and listen to the other person.
If you can't speak but can type and have access to the internet
If you can't speak but can type
Type and Read calls using a TTY allow you to type what you want to say and read the messages from the other person.