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User Guide
61
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 “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 hear-
ing device manufacturer or hearing health professional may help you choose the proper
rating for your mobile device. The more immune your hearing aid is, the less likely you are
to experience interference noise from mobile phones.
For more information about hearing aid compatibility, visit the FCC’s Consumer & Govern-
mental Affairs Bureau website at www.fcc.gov/cgb/dro
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