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 not be able to use a rated phone
successfully. Trying out the phone with your hearing
device is the best way to evaluate it for your personal
needs.
Phones rated M3/T3 or M4/T4 meet FCC requirements
and are likely to generate less interference to hearing
devices than phones that are not labeled. M4/T4 is the
better/higher of the two ratings.
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 about its return and
exchange policies and for information on hearing aid
compatibility.
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 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.
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