LG A380 User Manual page 108

Safety Guidelines
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 generate less
interference to hearing devices than phones
that are not labeled. T4 is the better/ higher of
the two ratings.
Hearing devices may also be rated. Your
hearing device manufacturer or hearing health
professional may help you find this rating.
Higher ratings mean that the hearing device
is relatively immune to interference noise.
The hearing aid and wireless phone rating
values are then added together. A sum of 5 is
considered acceptable for normal use. A sum
of 6 is considered for best use.
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In the above example, if a hearing aid meets
the M2 level rating and the wireless phone
meets the M3 level rating, the sum of the
two values equal M5. This should provide the
hearing aid user with "normal usage" while
using their hearing aid with the particular
wireless phone. "Normal usage" in this context
is defined as a signal quality that's acceptable
for normal operation.
The M mark is intended to be synonymous
with the U mark. The T mark is intended to be
synonymous with the UT mark. The M and T
marks are recommended by the Alliance for
Telecommunications Industries Solutions (ATIS).
The U and UT marks are referenced in Section
20.19 of the FCC Rules. The HAC rating and
measurement procedure are described in the
American National Standards Institute (ANSI)
C63.19 standard.
When you're talking on a cell phone, it's
recommended that you turn the BT (Bluetooth)
mode off for HAC.