Hearing Aid Compatibility With Mobile Phones - Motorola W156 Getting Started Manual

Hearing Aid Compatibility with
Mobile Phones
Some Motorola phones are measured for compatibility with 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 vary in the
amount of interference they generate.
The wireless telephone industry has developed ratings for some of
their mobile phones, to assist hearing device users in fi nding phones
that may be compatible with their hearing devices. Not all phones
have been rated. Phones that are rated have the rating on their box
or a label on the box.
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.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely
to generate less interference to 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 have telecoils in them.)