Answer or make RTT or TTY calls from your iPhone

RTT (real-time text) allows you to send text messages with a recipient during a phone call. RTT can also be used with a TTY (teletypewriter) device.

This feature is available for plans from service providers in the United States and Canada only. Standard voice call rates apply for both Software and Hardware RTT/TTY calls. Depending on your service provider, you may see RTT, TTY or RTT/TTY.

1. Go to Settings > Accessibility > RTT/TTY. 
2. Turn on Software RTT/TTY or Hardware TTY.
   
3. Tap Relay Number and enter a phone number for RTT/TTY relay calls.
4. RTT/TTY sends characters immediately as you type them. If you don't want to send text while you're typing, turn off Send Immediately to send full messages when you're ready instead.
5. To answer every call as RTT/TTY, turn on Answer All Calls as RTT/TTY.*
6. If you want to answer and make RTT/TTY calls from an external RTT/TTY device instead of your iPhone, turn on Hardware TTY. 

* If you turn on Answer All Calls as RTT/TTY, you won't receive voice calls anymore.

1. Open the Phone app.
2. Select your contact and tap their phone number.
3. Select RTT/TTY or RTT/TTY Relay.
   
4. Wait for the call to connect, then select RTT/TTY.
   
5. Enter your message.
   
   • If you've turned on Send Immediately in Settings, your recipient will see your message while you're typing it.
   • If you haven't, enter your message, then tap the Send button  to send it.
   • Want to find shortcut phrases? As you type, choices for words and phrases you'd probably type next will appear. Tap the arrow to the right of those words to find shortcut phrases, such as SK for "Ready to hang up" and GA for "Go ahead".

1. Open the Phone app.
2. Tap Recents.
3. Tap the More Info button  next to the call that you want to see. RTT/TTY calls have a telephone icon  next to them.
   
4. Tap the Outgoing Call or Incoming Call history.
   
5. You'll see a transcript of the call.