Huawei M660 Quick Start - Manual (Page 22)

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--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.
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.
Caution
Changes or modifications made to this device not expressly
approved by Huawei Technologies Co., Ltd. may void the
FCC authorization to operate this device.
Hearing Aid Compatibility (HAC) regulations for Mobile
phones
In 2003, the FCC adopted rules to make digital wireless telephones
compatible with hearing aids and cochlear implants. Although
analog wireless phones do not usually cause interference with
hearing aids or cochlear implants, digital wireless phones sometimes
do because of electromagnetic energy emitted by the phone's
antenna, backlight, or other components.
Your phone is compliant with FCC HAC regulations (ANSI C63.19).
While 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 a rating system for
wireless phones, to assist hearing device users find phones that may
be compatible with their hearing devices. Not all phones have been
rated. Phones 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