
Real-time text (RTT) is a communication service that allows people who are deaf or hard of hearing to communicate with hearing people over the phone using text. RTT is a more advanced protocol than traditional teletypewriter (TTY) service, as it transmits both text and audio in real time. This allows for more natural and fluid conversations.
How does RTT work?
RTT uses a special type of phone line that can transmit both text and audio. When you make an RTT call, your iPhone will automatically detect if the other person’s phone is also RTT-enabled. If it is, the call will be placed in RTT mode.
To use RTT, simply type your message into the text field on your iPhone screen. Your message will be sent to the other person immediately, and you will be able to see their response on your screen as they type it. You can also continue to speak during the call, and your voice will be transmitted to the other person.
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Benefits of using RTT
There are many benefits to using RTT, including:
- More natural and fluid conversations:RTT allows for more natural and fluid conversations than traditional TTY service, as both text and audio are transmitted in real time. This can be especially helpful for people who are deaf or hard of hearing, as it allows them to communicate more easily with hearing people.
- Greater access to communication:RTT is available on a wider range of devices than traditional TTY service, including iPhones, smartphones, and computers. This makes it easier for people who are deaf or hard of hearing to stay connected with friends, family, and colleagues.
- Increased independence:RTT allows people who are deaf or hard of hearing to make and receive phone calls independently, without the need for a relay interpreter. This can give them a greater sense of independence and freedom.
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How to use RTT on an iPhone
To use RTT on an iPhone, you must first enable it in the Settings app. To do this, go to Settings > Accessibility > RTT/TTY. Then, toggle on the Software RTT/TTY switch.
Once RTT is enabled, you can make an RTT call by opening the Phone app and dialing the number you want to call. When the call is connected, tap the RTT button in the top right corner of the screen.
To type a message during an RTT call, simply tap the text field at the bottom of the screen and start typing. Your message will be sent to the other person immediately. You can also continue to speak during the call, and your voice will be transmitted to the other person.
To end an RTT call, tap the End button in the top right corner of the screen.

Tips for using RTT
Here are a few tips for using RTT on an iPhone:
- Use abbreviations and acronyms:To speed up the typing process, you can use abbreviations and acronyms. For example, you can type “TTY” instead of “teletypewriter” and “TTY/RTT” instead of “teletypewriter/real-time text.”
- Use the keyboard settings:You can customize the keyboard settings on your iPhone to make it easier to type RTT messages. For example, you can enable auto-correct and predictive text.
- Use a headset:Using a headset can help to reduce background noise and improve the quality of your audio.
- Be patient:RTT is a new technology, and it may take some time to get used to. If you are having trouble, be patient and ask the other person for help.

FAQS
What is RTT?
RTT stands for Real-Time Text. It is a protocol that allows people who are deaf or hard of hearing to communicate with hearing people over the phone using text. With RTT, text is transmitted as you type, so the recipient can read your message right away.
How do I use RTT on my iPhone?
To use RTT on your iPhone, you will need to have a carrier that supports RTT and a compatible phone. You will also need to turn on RTT in your settings.
- Go toSettings > General > Accessibility.
- TapHearing.
- TapRTT/TTY.
- Turn onSoftware RTT/TTY.
How do I make an RTT call?
To make an RTT call, follow these steps:
- Open thePhoneapp.
- Dial the number you want to call.
- Tap theTTYbutton.
- Start typing your message.
What is the difference between RTT and TTY?
RTT is a newer protocol than TTY. It is also more advanced and offers a number of advantages over TTY, including:
- Faster transmission speeds:RTT text is transmitted as you type, so the recipient can read your message right away. TTY text is transmitted one character at a time, which can be slow.
- Better error correction:RTT has built-in error correction, which helps to ensure that your messages are transmitted accurately. TTY does not have built-in error correction.
- Support for emoji and other rich content:RTT supports emoji and other rich content, such as images and videos. TTY does not support emoji or other rich content.
Do I need a special phone to use RTT?
Most modern iPhones support RTT. To check if your iPhone supports RTT, go to Settings > General > Accessibility > Hearing. If you see Software RTT/TTY, then your iPhone supports RTT.
Conclusion
RTT is a valuable communication service for people who are deaf or hard of hearing. It allows them to communicate with hearing people over the phone using text, which can help them to stay connected with friends, family, and colleagues. If you have hearing or speech difficulties, I encourage you to try RTT. It is a great way to improve your communication and accessibility.
Here are some additional tips and information about using RTT on an iPhone:
- Turn off Send Immediately:If you don’t want to send text as you type, you can turn off Send Immediately in Settings > Accessibility > RTT/TTY. This will allow you to review your message before sending it.
- Use the RTT/TTY keyboard:The RTT/TTY keyboard provides additional symbols and characters that can be used in RTT messages.