Real-time text (RTT) is text transmitted instantly as it is typed or created. Recipients can immediately read the message while it is being written, without waiting. How to Turn Off RTT on iPhone
Real-time text is used for conversational text, in collaboration, and in live captioning. Technologies include TDD/TTY devices for the deaf, live captioning for TV, Text over IP (ToIP), some types of instant messaging, captioning for telephony/video teleconferencing, telecommunications relay services including ip-relay, transcription services including Remote CART, TypeWell, collaborative text editing, streaming text applications, next-generation 9-1-1/1-1-2 emergency service. Obsolete TDD/TTY devices are being replaced by more modern real-time text technologies, including Text over IP, ip-relay, and instant messaging.
During 2012, the Real-Time Text Taskforce (R3TF) designed a standard international symbol to represent real-time text, as well as the alternate name Fast Text to improve public education of the technology.
Real-time text (RTT) is an iPhone accessibility feature that you can’t remove but, if you don’t need it, you can turn it off. The feature is enabled in your iPhone’s accessibility settings.
Here’s how to turn off RTT on an iPhone:
Scroll down, and tap Accessibility.
Scroll down, and tap RTT/TTY.
Tap the Software RTT/TTY toggle to disable it.
If necessary, tap the Hardware TTY toggle to disable it as well.
RTT and TTY are now disabled on your iPhone.
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