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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
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