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Appendix
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.
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 equals 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 components must be disabled during a 
call. See page 66 for instructions to disable these components.
FCC Regulatory Compliance 
FCC Regulatory Compliance
This device complies with Part 15 of the FCC Rules. Operation 
is subject to the following two conditions: (1) this device may 
not cause harmful interference, and (2) this device must 
accept any interference received, including interference 
that may cause undesired operation. Your mobile device is 
a low power radio transmitter and receiver. When it is ON, it 
receives and also sends out radio frequency (RF) signals. In 
August 1996, the Federal Communications Commission (FCC) 
adopted RF exposure guidelines with safety levels for mobile 
devices. Those guidelines are consistent with safety standards 
previously set by both U.S. and international standards 
bodies: American National Standard Institute (ANSI), 
National Council of Radiation Protection and Measurements 
(NCRP), and International Commission on Non-Ionizing 
Radiation Protection (ICNRP). Those standards were based 
on comprehensive and periodic evaluations of the relevant 
scientific literature. The design of your phone complies with 
the FCC guidelines and applicable.
Statement according to FCC part 15.105
This equipment has been tested and found to comply 
with the limits for a Class B digital device, pursuant to Part 
15 of the FCC Rules. These limits are designed to provide 
reasonable protection against harmful interference in a 
residential installation. This equipment generates uses and 
can radiate radio frequency energy and, if not installed and 
used in accordance with the instructions, may cause harmful 
interference to radio communications. However, there is 
no guarantee that interference will not occur in a particular 
installation. If this equipment does cause harmful interference 
to radio or television reception, which can be determined by