Mac User Guide
- Welcome
- What’s new in macOS Tahoe
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- Intro to Apple Intelligence
- Translate messages and calls
- Create original images with Image Playground
- Create your own emoji with Genmoji
- Use Apple Intelligence with Siri
- Find the right words with Writing Tools
- Summarize notifications and reduce interruptions
- Use ChatGPT with Apple Intelligence
- Apple Intelligence and privacy
- Block access to Apple Intelligence features
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- Intro to Continuity
- Use AirDrop to send items to nearby devices
- Hand off tasks between devices
- Control your iPhone from your Mac
- Copy and paste between devices
- Stream video and audio with AirPlay
- Make and receive calls and text messages on your Mac
- Use your iPhone internet connection with your Mac
- Share your Wi-Fi password with another device
- Use iPhone as a webcam
- Insert sketches, photos, and scans from iPhone or iPad
- Unlock your Mac with Apple Watch
- Use your iPad as a second display
- Use one keyboard and mouse to control Mac and iPad
- Sync music, books, and more between devices
- Resources for your Mac
- Resources for your Apple devices
- Copyright and trademarks
Change RTT settings for accessibility on Mac
On your Mac, use RTT settings to set up your Mac to make and receive Real-Time Text (RTT) calls.
To change these settings, choose Apple menu 
in the sidebar, then click RTT. (You may need to scroll down.)
Note: These settings are shown only when you have set up your iPhone and Mac for Wi-Fi calling, and RTT phone calls are enabled on your iPhone. Wi-Fi calling and RTT are not available in all countries or regions, or supported by all carriers.
Option | Description |
|---|---|
Enable RTT | Make and receive RTT calls on your Mac without using a special device. When this option is turned on and you make a phone call on your Mac, you can choose to use audio, RTT, or RTT relay for the call. |
Send immediately | Send characters as you type them. To type full messages before you send them, turn this option off. |
RTT relay number | The relay service to use when you make an RTT relay call on your Mac. If a number isn’t specified, your carrier’s default relay service is used. |
After you set up RTT on your Mac, 
appears in some apps. For example, appears in Contacts when you move the pointer over a contact’s phone number to indicate that you can make an RTT call.
Depending on your network environment, an RTT call may be downgraded to a Teletypewriter (TTY) call.
Important: When making an emergency call in the U.S. on your Mac, special characters or tones are sent to alert the operator. The operator’s ability to receive or respond to these tones can vary depending on your location. Apple doesn’t guarantee that the operator will be able to receive or respond to an RTT call.