Samsung GALAXY S3 Owner's Manual page 82

The wireless telephone industry has developed a
rating system for wireless mobile devices to assist
hearing device users find mobile devices that may be
compatible with their hearing devices. Not all mobile
devices have been rated. Mobile devices that are
rated have the rating on their box or a label located
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
mobile device successfully. Trying out the mobile
device with your hearing device is the best way to
evaluate it for your personal needs.
M-Ratings: Wireless mobile devices rated M3 or M4
meet FCC requirements and are likely to generate
less interference to hearing devices than mobile
devices that are not labeled. M4 is the better/higher
of the two ratings. M-ratings refer to enabling
acoustic coupling with hearing aids that do not
operate in telecoil mode.
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