Zte Blade A3 Prime User Manual page 58

incoming RTT call. You can still switch from voice-only to RTT
during the calls. See

Always visible: In this mode, you may select the mode for
outgoing calls.
3. When RTT operation mode is set as Always visible, touch RTT
on Outgoing Call to set the default mode for outgoing calls. You
can choose to place all outgoing calls as RTT calls automatically
or choose manually each time before placing the call.
Place an RTT Call
When the RTT operation mode is set as Always visible, you can
place an RTT call directly.
1. Enter the phone number with the dialpad as usual.
2. Touch .
3. If RTT on Outgoing Call is set as Manual, touch RTT Voice call.
When the call is connected, the RTT message screen and keyboard
appear automatically.
Answer an RTT Call
Regardless of your RTT operation mode settings, an incoming RTT
call is answered as an RTT call, with the RTT message screen and
keyboard appearing automatically.
NOTE:
This feature may not work under or across different networks.
Switch From Voice-only Calls to RTT
58
Calls.