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T-Ratings: Phones rated T3 or T4 meet FCC
requirements and are likely to generate less
interference to hearing devices than phones that
are not labeled. T4 is the better/higher of the two
ratings.
Hearing devices may also be rated. Your hearing
device manufacturer or hearing health professional
may help you find this rating. Higher ratings mean
that the hearing device is relatively immune to
interference noise. The hearing aid and wireless
phone rating values are then added together. A
sum of 5 is considered acceptable for normal use.
A sum of 6 is considered for best use.
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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 a rating system for wireless
phones, to assist hearing device users
to find 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 located 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.
Hearing devices may also be rated.
Your hearing device manufacturer or
hearing health professional may help
you find this rating. Higher ratings
mean that the hearing device is
relatively immune to interference
noise. The hearing aid and wireless
phone rating values are then added
together. A sum of 5 is considered
acceptable for normal use. A sum of 6
is considered for best use.
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In the above example, if a hearing aid meets the
M2 level rating and the wireless phone meets the
M3 level rating, the sum of the two values equal
M5. This should provide the hearing aid user with
“normal usage” while using their hearing aid with
the particular wireless phone. “Normal usage” in
this context is defined as a signal quality that’s
acceptable for normal operation.