Zte N9517 User Manual page 70

Setting 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. Tap the Home key > > > Settings > 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.
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