Samsung GALAXY S3 Owner's Manual page 83

T-Ratings: Mobile devices rated T3 or T4 meet
FCC requirements and are likely to generate less
interference to hearing devices than mobile devices
that are not labeled. T4 is the better/higher of the two
ratings. T-ratings refer to enabling inductive coupling
with hearing aids operating in telecoil mode.
Hearing devices may also be rated. Your hearing aid
manufacturer or hearing health professional may
help you find this rating. Higher ratings mean that the
hearing device is relatively immune to interference
noise.
Under the current industry standard, American
National tandards Institute (ANSI) C63.19, the hearing
aid and wireless mobile device rating values are
added together to indicate how usable they are
together. For example, if a hearing aid meets the M2
level rating and the wireless mobile device meets the
M3 level rating, the sum of the two values equals M5.
Under the standard, this should provide the hearing
aid user with normal use while using the hearing aid
with the particular wireless mobile device. A sum of 6
or more would indicate excellent performance.
However, these are not guarantees that all users will
be satisfied. T ratings work similarly.
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