20Health and safety informationhearing device°Øs telecoil (°×T Switch°± or°×Telephone Switch°±) than unrated phones. T4 isthe better/higher of the two ratings. (Note that not allhearing devices have telecoils in them.)Hearingdevices may also be measured for immunity to thistype of interference. Your hearing devicemanufacturer or hearing health professional mayhelp you find results for your hearing device. Themore immune your hearing aid is, the less likely youare to experience interference noise from mobilephones.Other Medical DevicesIf you use any other personal medical devices,consult the manufacturer of your device to determineif it is adequately shielded from external RF energy.Your physician may be able to assist you in obtainingthis information. Switch your phone off in health carefacilities when any regulations posted in these areasinstruct you to do so. Hospitals or health carefacilities may be using equipment that could besensitive 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 shouldalso consult the manufacturer of any equipment thathas been added to your vehicle.