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The wireless telephone industry has developed a rating system for
wireless phones, to assist hearing device users 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.
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.
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 is synonymous for T ratings. 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 is acceptable for normal operation.
The M mark is intended to be synonymous with the U mark. The T mark is
intended to be synonymous with the UT mark. The M and T marks are
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