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industry has developed ratings for
some of their mobile phones, to
assist hearing device users in finding
phones that may be compatible
with their hearing devices. Not all
phones have been rated. Phones
that are rated have the rating on
their box or a label on the box. The
ratings are not guarantees. Results
will vary depending on the user’s
hearing device and 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 to
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 have telecoils in them.)
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. The
more immune your hearing aid is,
the less likely you are to experience
interference noise from mobile
phones.
To ensure that the Hearing Aid
Compatibility rating for your phone is
maintained, secondary transmitters
such as Bluetooth
®
and WLAN
components must be disabled during
a call.