User's Manual

Health and safety information
25
Hearing Aid Compatibility 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 (“ TSwitch” 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.