Phone
When I call a certain person I get a icon of a phone over a keyboard and the other person can’t hear me. I went to setting to turn it off but it wasn’t even on. What’s going on!?
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That means the number you are calling is for RTT (aka TTY), a service for hearing impaired users that uses text instead of audio. This article explains it→Answer or make RTT or TTY calls from your iPhone - Apple Support
