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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 have telecoils in them.)
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. The more
immune your hearing aid is, the less likely you are to
experience interference noise from mobile phones.
Safety Guidelines
89
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