87Other Medical DevicesIf you use any other personal medicaldevices, consult the manufacturer of yourdevice to determine if it is adequatelyshielded from external RF energy. Yourphysician may be able to assist you inobtaining this information. Switch yourphone off in health care facilities when anyregulations posted in these areas instructyou to do so. Hospitals or health carefacilities may be using equipment that couldbe sensitive to external RF energy.VehiclesRF signals may affect improperly installed orinadequately shielded electronic systems inmotor vehicles. Check with themanufacturer or its representative regardingyour vehicle. You should also consult themanufacturer of any equipment that hasbeen added to your vehicle.Posted FacilitiesSwitch your phone off in any facility whereposted notices require you to do so.Potentially Explosive EnvironmentsSwitch your phone off when in any area witha potentially explosive atmosphere and obeyall signs and instructions. Sparks in suchareas could cause an explosion or fireresulting in bodily injury or even death.Users are advised to switch the phone offwhile at a refueling point (service station).Users are reminded of the need to observerestrictions on the use of radio equipment infuel depots (fuel storage and distributionareas), chemical plants or where blastingoperations are in progress.Areas with a potentially explosiveatmosphere are often but not always clearlymarked. They include below deck on boats,chemical transfer or storage facilities,vehicles using liquefied petroleum gas (suchas propane or butane), areas where the aircontains chemicals or particles, such asgrain, dust or metal powders, and any otherarea where you would normally be advisedto turn off your vehicle engine.