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101
Safety Guidelines
standard incorporates a substantial margin of safety
to give additional protection for the public and to
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.)
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 73 for instructions to disable
these components.