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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 ("Switch" 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.
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