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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 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.