Zte Z791 User Manual page 64

carrier is the default.
4. Touch Setup > Voicemail number to edit the voicemail
number if necessary.
Set TTY Mode
Select a TTY mode for your phone to work with a teletypewriter,
or turn TTY off.
1. Touch the Home Key >
2. In the dialer tab, touch Menu Key > Settings > TTY mode.
3. Select one of the following options. Consult your
teletypewriter manufacturer's manual if necessary.
TTY Off: Users who can hear and talk can disable TTY

support.
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.
.
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