what is rtt on iphone

RTT on iPhone stands for Real-Time Text, which is a protocol for text calls. It allows users to have a real-time text conversation during a phone call, where the recipient can see the message as it is being typed. This feature is particularly useful for individuals with hearing or speech difficulties. RTT can be used with a TTY (teletypewriter) device and is available on iPhone plans from carriers in the United States and Canada. To set up RTT on an iPhone, users can go to Settings > Accessibility > RTT/TTY and turn on Software RTT/TTY or Hardware TTY. Once enabled, users can start an RTT or TTY call by opening the Phone app, selecting a contact, and tapping the phone number, then choosing RTT/TTY Call or RTT/TTY Relay Call. When RTT or TTY is turned on, an indicator appears in the status bar at the top of the screen. RTT is a valuable accessibility feature that enhances communication for individuals with hearing or speech impairments.