Blackberry Bold 9790 Safety And Product Information page 35

Consulting with your hearing health professional and testing the wireless
device with your hearing device is the best way to evaluate it for your
personal needs.
This BlackBerry smartphone has been tested and rated for use with hearing
aids for some of the wireless technologies that the BlackBerry smartphone
uses. However, other wireless technologies may be used in this BlackBerry
smartphone that have not been tested for use with hearing aids. It is
important to try the different features of your BlackBerry smartphone
thoroughly and in different locations to determine if you hear any
interfering noise when using this BlackBerry smartphone with your hearing
aid or cochlear implant. Consult your wireless service provider about its
return and exchange policies and for information about hearing aid
compatibility.
How the ratings work
M-Ratings: Wireless devices rated M3 or M4 meet FCC requirements and
are likely to generate less interference to hearing devices than wireless
devices that are not labeled. M4 is the better or higher of the two ratings.
T-Ratings: Wireless devices 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 wireless devices. T4 is the better or
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 wireless devices.
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