Section 12: Health and Safety Information 207Using Your Phone Near Other Electronic DevicesSection 12M-Ratings: Phones rated M3 or M4 meet FCCrequirements and are likely to generate less interferenceto hearing devices than phones that are not labeled. M4 isthe better/higher of the two ratings.T-Ratings: Phones rated T3 or T4 meet FCC requirementsand are likely to be more usable with a hearing device’stelecoil (“T Switch” or “Telephone Switch”) than unratedphones. T4 is the better/higher of the two ratings. (Notethat not all hearing devices have telecoils in them.)Hearing devices may also be measured for immunity tothis type of interference. Your hearing devicemanufacturer or hearing health professional may helpyou find results for your hearing device. The moreimmune your hearing aid is, the less likely you are toexperience interference noise from mobile phones.Other Medical DevicesIf you use any other personal medical devices, consult themanufacturer of your device to determine if it isadequately shielded from external RF energy. Yourphysician may be able to assist you in obtaining thisinformation. Switch your phone off in health care facilitieswhen any regulations posted in these areas instruct you todo so. Hospitals or health care facilities may be usingequipment that could be sensitive to external RF energy.VehiclesRF signals may affect improperly installed orinadequately shielded electronic systems in motorvehicles. Check with the manufacturer or itsrepresentative regarding your vehicle. You should also
