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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 ("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.
Your phone meets the M4/T4 level rating. Hearing devices may also be rated. Your
hearing device manufacturer or hearing health professional may help you find this
rating.
For more information about the FCC Hearing Aid Compatibility please go to http://
www.fcc.gov/cgb/dro.
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