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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 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
Information from the World Health Organization
Present scientific information does not indicate the need for any
WHO Information
special precautions for the use of mobile phones. If you are
concerned, you may want to limit your own or your children's RF
exposure by limiting the length of calls or by using handsfree
devices to keep mobile phones away from your head and body.
Source: WHO Fact Sheet 193
Further information: http://www.who.int./peh-emf
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 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.
WHO Information
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