To switch from a voice call to an RTT call, with "Always visible" or "Visible during call" enabled in the Settings menu, simply tap the "RTT" icon during your call.
To switch from an RTT call to a voice call, tap the "Menu" icon (indicated by 3 vertical dots). Then, tap "Hide RTT keyboard" or "Switch to voice call."
Your device and/or carrier may provide additional features. To access these options, tap the "Menu" icon. Then, tap the following:
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