Zte blade V8 PRO User Manual page 81

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
Your phone supports the Hearing Aid Compatibility (HAC)
function. When you turn on the hearing aid compatibility and use
a hearing aid with a telecoil to answer the phone, it will help you
hear more clearly during the phone call.
1. Press the Home key >
Accessibility.
2. Check Hearing aids to turn on hearing aid compatibility.
CAUTION:
Do not turn on the Hearing aids option unless you use a hearing
aid with a telecoil. Using this setting without a hearing aid or with
a hearing aid without a telecoil may be harmful to your hearing.
Set Voicemail
1. Press the Home key >
settings.
2. Touch a nano-SIM card and touch Voicemail.
> > Call settings >
> > Call settings > Carrier
81