Other medical devices – Samsung SCH-A645BKAATL User Manual
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Section 14: Health and Safety Information
199
Using Your Phone Near Other Electronic Devices
Section 14
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 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.
Other Medical Devices
If you use any other personal medical devices, consult 
the manufacturer of your device to determine if it is 
adequately shielded from external RF energy. Your 
physician may be able to assist you in obtaining this 
information. Switch your phone off in health care 
facilities when any regulations posted in these areas 
instruct you to do so. Hospitals or health care facilities 
may be using equipment that could be sensitive to 
external RF energy.