What is RTT? How do I turn off RTT on Android? Step By
Aug 11, 2021 · RTT implementation in Android 9 is described on this page. RTT replaces Text Telephone (TTY) technology for deaf or hard of hearing people. Users may make voice and RTT calls using the same phone number, send text character-by-character while typing, enable 911 communications, and employ TTY backward compatibility.
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