User manual

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This phone has been tested and rated for use with
hearing aids for some of the wireless technologies
that it uses. However, there may be some newer
wireless technologies used in this phone that have
not been tested yet for use with hearing aids. It is
important to try the different features of this phone
thoroughly and in different locations, using your
hearing aid or cochlear implant, to determine if you
hear any interfering noise. Consult your service
provider or the manufacturer of this phone for
information on hearing aid compatibility. If you have
questions about return or exchange policies, consult
your service provider or phone retailer.
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 be more usable with a
hearing device’s telecoil (“T Switch” or “Telephone
Switch”) than unrated phones. T4 is the better/higher
of the two ratings. (Note that not all hearing devices
contain telecoils.)
Your 6400C has been tested for hearing aid device
compatibility and has an M4/T3 rating.
Hearing devices may also be measured for immunity
to this type of interference. Your hearing device
manufacturer or hearing health professional may