What is RTT on iPhone 8

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  • With iOS 11.2, you can now use the RTT (real-time text) protocol for conversational text calls.

    RTT also allows you to combine voice and text calls. Both incoming and outgoing calls that start as voice, then upgrade to RTT will keep the microphone active.

    More info from HT208254

    support.apple.com-en-us-HT208254

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