83Health and safety informationOther medical devicesIf you use any other personal medicaldevices, consult the manufacturer of yourdevice to determine if it is adequatelyshielded from external RF energy.Your physician may be able to assist you inobtaining this information.Switch off your phone in health care facilitieswhen regulations posted in these areasinstruct you to do so.VehiclesRF signals may affect improperly installed orinadequately shielded electronic systems inmotor vehicles. Check with themanufacturer or its representative regardingyour vehicle.You should also consult the manufacturer ofany equipment that has been added to yourvehicle.Posted facilitiesSwitch off your phone in any facility whereposted notices require you to do so.Potentially explosive environmentsSwitch off your phone when in any area witha potentially explosive atmosphere, andobey all signs and instructions. Sparks insuch areas could cause an explosion or fireresulting in bodily injury or even death.Users are advised to switch off the phonewhile at a refuelling 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 the areas below deckson boats, chemical transfer or storagefacilities, vehicles using liquefied petroleumgas, such as propane or butane, areaswhere the air contains chemicals orparticles, such as grain, dust or metalpowders, and any other area where youwould normally be advised to turn off yourvehicle engine.