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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.
M-Ratings:
Phones rated M3 or M4 meet FCC
requirements and are likely to generate less
interference with 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.) The more
immune your hearing aid device is, the less likely
you are to experience interference noise from
your wireless phone.
Hearing devices may also be measured for
immunity to this type of interference. Your hearing
device manufacturer or hearing health
professional may help you find results for your
hearing device.
For additional information about the FCC's actions
with regard to hearing aid compatible wireless
devices and other steps the FCC has taken to
ensure that individuals with disabilities have
access to telecommunications services, please go
to www.fcc.gov/cgb/dro.
