Nokia 9110 Quick Manual page 33

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Should use the ear opposite the pacemaker to minimise the potential for
interference.
If you have any reason to suspect that interference is taking place, switch off
the phone of your communicator immediately.
Hearing aids: Some digital wireless phones may interfere with some hearing aids.
In the event of such interference, you may want to consult your service provider.
Other medical devices: Operation of any radio transmitting equipment,
including communicators, may interfere with the functionality of
inadequately protected medical devices. Consult a physician or the
manufacturer of the medical device to determine if they are adequately
shielded from external RF energy or if you have any questions. Switch off the
phone of your communicator 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.
Vehicles: RF signals may affect improperly installed or inadequately shielded
electronic systems in motor vehicles (e.g. electronic fuel injection systems,
electronic anti-skid (anti-lock) braking systems, electronic speed control
systems, air bag systems). Check with the manufacturer or its representative
regarding your vehicle. You should also consult the manufacturer of any
equipment that has been added to your vehicle.
Posted facilities: Switch off the phone of your communicator in any facility
where posted notices so require.
Potentially explosive atmospheres
Switch off the phone of your communicator when in any area with a potentially
explosive atmosphere and obey all signs and instructions. Sparks in such areas
could cause an explosion or fire resulting in bodily injury or even death.
Users are advised to switch off the phone when at a refuelling point (service
station). Users are reminded of the need to observe restrictions on the use of
radio equipment in fuel depots (fuel storage and distribution areas), chemical
plants or where blasting operations are in progress.
Areas with a potentially explosive atmosphere are often but not always clearly
marked. They include below deck on boats; chemical transfer or storage
facilities; vehicles using liquified petroleum gas (such as propane or butane);
areas where the air contains chemicals or particles, such as grain, dust or
metal powders; and any other area where you would normally be advised to
turn off your vehicle engine.
Vehicles
Only qualified personnel should service the communicator, or install the
communicator in a vehicle. Faulty installation or service may be dangerous
and may invalidate any warranty which may apply to the unit.
Check regularly that all wireless phone equipment in your vehicle is mounted
and operating properly.