Samsung SCH-N330PWVXAR - Manual (Page 146)

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noise, and phones also vary in the amount of interference
they generate.
The wireless telephone industry has developed ratings for
some of their mobile phones, to assist hearing device users in
finding phones that may be compatible with their hearing
devices. Not all phones have been rated. Phones that are
rated have the rating on their box or a label on the box.
The ratings are not guarantees. Results will vary depending
on the user’s hearing device and hearing loss. If your hearing
device happens to be vulnerable to interference, you may not
be able to use a rated phone 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 “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. Optional for each phone manufacturer.