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Safety Guidelines
117
account for any variations in measurements.
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.)
T-coil statement for CF360
Achieve optimal antenna performance of the
phone by sliding the phone open to make or
receive a call.
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.
See Page 89 for instructions to disable these
components.