How To Use Rtt Relay Service On S10+

Set up and use RTT and TTY on iPhone

If you have hearing or speech difficulties, you can communicate past telephone using Teletype (TTY) or real-fourth dimension text (RTT)—protocols that transmit text as you type and allow the recipient to read the bulletin correct away. RTT is a more avant-garde protocol that transmits audio every bit y'all type text.

iPhone provides built-in Software RTT and TTY from the Phone app—it requires no boosted devices. If you lot turn on Software RTT/TTY, iPhone defaults to the RTT protocol whenever it'south supported past the carrier.

iPhone also supports Hardware TTY, and then yous can connect iPhone to an external TTY device with the iPhone TTY Adapter (sold separately in many regions).

Important: RTT and TTY aren't supported by all carriers or in all countries or regions. RTT and TTY functionality depends on your carrier and network environment. When making an emergency call in the U.S., iPhone sends special characters or tones to alarm the operator. The operator's power to receive or respond to these tones tin can vary depending on your location. Apple doesn't guarantee that the operator will be able to receive or answer to an RTT or TTY call.

Gear up RTT and TTY

Go to Settings > Accessibility.
Tap RTT/TTY or TTY, then do any of the following:
- If your iPhone has Dual SIM, choose a line.
- Plow on Software RTT/TTY or Software TTY.
- Tap Relay Number, and then enter the telephone number to use for relay calls using Software RTT/TTY.
- Turn on Send Immediately to send each graphic symbol as yous blazon. Turn off to consummate messages before sending.
- Turn on Answer All Calls equally RTT/TTY.
- Plow on Hardware TTY.
When RTT or TTY is turned on, appears in the status bar at the superlative of the screen.

Connect iPhone to an external TTY device

If you turned on Hardware TTY in Settings, connect iPhone to your TTY device using the iPhone TTY Adapter. If Software TTY is also turned on, incoming calls default to Hardware TTY. For information well-nigh using a detail TTY device, see the documentation that came with information technology.

Kickoff an RTT or TTY phone call

In the Phone app, cull a contact, so tap the telephone number.
Choose RTT/TTY Call or RTT/TTY Relay Call.
Wait for the call to connect, then tap RTT/TTY.

iPhone defaults to the RTT protocol whenever it'south supported past the carrier.

If you haven't turned RTT on and you receive an incoming RTT phone call, tap the RTT button to answer the call with RTT.

Type text during an RTT or TTY call

Enter your bulletin in the text field.

If y'all turned on Transport Immediately in Settings, your recipient sees each character as you type. Otherwise, tap to ship the bulletin.
To also transmit audio, tap .

Review the transcript of a Software RTT or TTY call

In the Telephone app, tap Recents.

RTT and TTY calls have next to them.
Next to the call you desire to review, tap .

Note: Continuity features aren't available for RTT and TTY support. Standard voice call rates apply for both Software RTT/TTY and Hardware TTY calls.