Zte Z799VL User Manual page 64

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 TTY Full: Users who cannot talk or hear may use this
mode to send and receive text messages through a TTY
device.
 TTY HCO: Users who can hear, but cannot talk, may use
this mode to listen to conversation of the other party and
respond via text messages.
 TTY VCO: Users who can talk, but cannot hear, may use
this mode to talk through the phone and receive
responses via text messages.
Set hearing aids
1. Touch the Home key >
Settings > Calling settings.
2. Check Hearing aids to turn on hearing aid compatibility.
Forward Incoming Calls
Call forwarding feature allows you to forward your incoming calls
to another phone number.
1. Touch the Home key >
Settings > Call settings.
2. Touch Call forwarding.
3. Touch an available option ( Always forward, Forward when
busy, Forward when unanswered, or Cancel All
Forwarding) to enable it.
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