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Hearing Aid Compatibility
(HAC) with Mobile Phones
When some mobile phones are
used near some hearing devices
(hearing aids and cochlear
implants),users may detect a
buzzing, humming, or whining
noise. Some hearing devices are
more immune than others to this
interference noise, and phones
also vary in the amount of
interference they generate. The
wireless telephone 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.)
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