Zte V768 User Manual page 102

Your ZTE V768 has been tested for hearing aid device
compatibility and has an T3 and M3 rating.
These ratings are not guaranteed. Results will vary,
depending on the level of immunity of your hearing device
and the degree of your hearing loss. If your hearing device
happens to be vulnerable to interference, you may not be
able to use a rated phone successfully. Trying out the phone
with your hearing device is the best way to evaluate it for
your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements
and are likely to generate less interference with hearing
devices than phones that are not labeled. M4 is the
better/higher of the two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements
and are likely to be more usable with a hearing device's
telecoil ("T Switch" or "Telephone Switch") than unrated
phones. T4 is the better/higher of the two ratings. (Note that
not all hearing devices contain telecoils.) The more immune
your hearing aid device is, the less likely you are to
experience interference noise from your wireless phone.
Hearing devices may also be measured for immunity to this
type of interference. Your hearing device manufacturer or
hearing health professional may help you find results for your
hearing device.
For additional information about the FCC's actions with
regard to hearing aid compatible wireless devices and other
steps the FCC has taken to ensure that individuals with
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