Information From The World Health Organization - Motorola hint QA30 Manual Del Usuario

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 be more usable with a hearing device's telecoil ("T Switch" or

Information from the World Health Organization

WHO Information
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"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.