UTStarcom PPC-6700 - Manuel (Page 163)

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the manual: 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 turning the equipment off
and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment
and receiver.
Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician
for help.
Using Your Phone With a Hearing Aid Device
Your PPC-6700 has been tested for hearing aid device compatibility.
When some wireless phones are used near some hearing devices
(hearing aids and cochlear implants), users may detect a buzzing,
humming, or whining noise. Some hearing devices are more
immune than others to this interference noise, and phones also vary
in the amount of interference they generate.
The wireless telephone industry has developed ratings for some of
their mobile phones, to assist hearing device users in finding phones
that may be compatible with their hearing devices. Not all phones
have been rated. Phones that are rated will have the rating on the
box. Your PPC-6700 has an M3 rating.
Note:
Phones rated M3 or M4 meet FCC requirements and
may generate less interference to hearing devices than
phones that are not labeled. M4 is the better/higher of
the two ratings .