Apps
Real Time Text (RTT)
Type back and forth in real time with the other person while on a call.
You can use RTT whenever you are calling someone whose phone also supports RTT or is connected to a teletypewriter (TTY) device. The RTT icon appears on all incoming RTT calls.
1.From 
Phone, tap 
More options > Settings.
2.Tap Real time text for the following options:
•RTT call button: Choose a visibility option for the RTT call button.
–Visible during calls: Show the RTT call button only during calls.
–Always visible: Show the RTT call button on the keypad and during calls.
•Use external TTY keyboard: Hide the RTT keyboard when an external TTY keyboard is connected.
•TTY mode: Choose the preferred TTY mode for the keyboard in use.
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