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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 with 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
contain telecoils.) The more immune your hearing aid device is,
the less likely you are to experience interference noise from your
wireless phone.
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.
For additional information about the FCC's actions with regard to
hearing aid compatible wireless devices and other steps the FCC
has taken to ensure that individuals with disabilities have access
to telecommunications services, please go to
www.fcc.gov/cgb/dro.
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