Pantech C520 User Manual page 88

A sum of 5 is considered acceptable for normal use. A sum of 6 is
considered for best use.
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 is synonymous for T ratings. 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 is 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.
To ensure that the Hearing Aid Compatibility rating for your phone is
maintained, secondary transmitters such as Bluetooth and WLAN
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components must be disabled during a call. See Page XX for instructions
to disable these components.
**This device contains GSM functions that are not operational in
U.S. Territories; this filing is applicable only for 850 MHz GSM and 1900
MHz PCS operations.