Zte Blade 10 - Using Real-Time Text (RTT)

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 If the phone screen is locked, swipe down on the screen to reject
the call, or swipe away from to reject the call and send a
message to the caller.
NOTE:
To edit the preset text responses, open the Phone app and touch
> Settings > Quick responses.
Using Real-Time Text (RTT)
Your phone supports Real-Time Text. If you or person on the other
end of the line has a hearing or speech impairment, you can use RTT
on top of a voice call for a real-time conversation.
NOTE:
You can use RTT only when the phone is connected to the Verizon
Wireless 4G LTE network.
Set Up RTT Work Mode
1. From the home screen, touch > > Settings >
Accessibility > Real Time Text (RTT) call.
2. Touch RTT operation mode and choose one of the following to
set when RTT options should be available:
 Visible during calls: In this mode, calls will be placed and
answered as voice-only calls by default unless you receive an
incoming RTT call. You can still switch from voice-only to RTT
during the calls. See Switch From Voice-only Calls to RTT Calls.