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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 a rating system for wireless phones, to assist
hearing device users find 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
located 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.)
Hearing devices may also be measured.
Your phone meets the M4/T3 level rating. Hearing devices may also be rated. Your hearing
device manufacturer or hearing health professional may help you find this rating.
For more information about the FCC Hearing Aid Compatibility please go to
http://www.fcc.gov/cgb/dro.
