Hearing Aid Compatibility with Mobile Phones
Some Motorola phones are measured for compatibility with
Hearing Aids
hearing aids. If the box for your particular model has "Rated for
Hearing Aids" printed on it, the following explanation applies.
When some mobile phones are used near some hearing devices
(hearing aids and cochlear implants), users may detect a buzzing,
humming, or whining noise. Some hearing devices are more
immune than others to this interference noise, and phones also
All manuals and user guides at all-guides.com
Phones rated T3 or T4 meet FCC
T-Ratings:
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.)