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C79 User Manual 
20 
When some wireless 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 finding phones 
that may be compatible with their hearing devices. Not all phones have been rated. Phones 
that have been rated have a label on the box. Your C79 has been tested for hearing aid 
device compatibility and has an M[4] and/or T[4] rating. 
These ratings are not guarantees. Results will vary, depending on the level of immunity of 
your hearing device and the degree of your 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 with 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 
contain telecoils.) The more immune your hearing aid device is, the less likely you are to 
experience interference noise from your wireless phone. Hearing aid devices should have 
ratings similar to those of phones. Ask your hearing health-care professional for the rating 
of your hearing aid.  
 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 wireless devices.