What's the RTT icon over the mute icon?

Why is the icon phone with RTT

iPhone 7 Plus, iOS 15

Posted on Nov 20, 2021 9:57 AM

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Demo

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Posted on Nov 20, 2021 10:06 AM

Take a look at this.

Answer or make RTT or TTY calls from your iPhone - Apple Support

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Demo

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Nov 20, 2021 10:06 AM in response to Cdavidson47

Take a look at this.

Answer or make RTT or TTY calls from your iPhone - Apple Support

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What's the RTT icon over the mute icon?

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