ZTE Grand X Plus - Manual (Page 76)

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X
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.
X
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 HAC (Hearing Aid Compatibility) 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. Touch the Home Key > > > Settings.
2. Check Hearing aids to turn on hearing aid compatibility.
Set DTMF Tones
You can set the length of Dual-tone multi-frequency (DTMF)
signal tones.
1. Touch the Home Key > > > Settings > DTMF tones.
2. Touch Normal or Long.
Set Speed Dials
You can touch and hold the 1 ~ 9 keys from the dialpad to call the
corresponding speed dial number.
The number key 1 is reserved to speed dial your voicemail.