Samsung SPH-M840UWABST - Manual (Page 170)

When your Device is Wet
Do not turn on your device if it is wet. If your device is
already on, turn it off and remove the battery
immediately (if the device will not turn off or you
cannot remove the battery, leave it as-is). Then, dry
the device with a towel and take it to a service center.
FCC Hearing Aid Compatibility (HAC)
Regulations for Wireless Devices
The U.S. Federal Communications Commission (FCC)
has established requirements for digital wireless
mobile devices to be compatible with hearing aids
and other assistive hearing devices.
When individuals employing some assistive hearing
devices (hearing aids and cochlear implants) use
wireless mobile devices, they may detect a buzzing,
humming, or whining noise. Some hearing devices
are more immune than others to this interference
noise, and mobile devices also vary in the amount of
interference they generate.
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.
2C. Settings 161