Nokia 7210 - Manual (Page 151)

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Hearing aids
Some digital wireless phones may interfere with hearing aids. In the event
of such interference, consult your wireless provider.
Other medical devices
Operation of any radio transmitting equipment, including cellular phones,
may interfere with the functionality of inadequately protected medical
devices. Consult a physician or the manufacturer of the medical device to
determine if it is adequately shielded from external RF energy, or if you
have any questions.
Switch off your phone in health care facilities when regulations posted in
these areas instruct you to do so. Hospitals or health care facilities may
be using equipment that could be sensitive to RF energy.
Electronic devices
Most modern electronic equipment is shielded from radio frequency (RF)
signals. However, certain electronic equipment may not be shielded
against the RF signals emanating from your wireless phone.
Posted facilities
Switch your phone off in any facility where posted notices so require.
Potentially explosive atmospheres
Switch off your phone 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
regarding 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/
storage facilities, vehicles using liquefied petroleum gas (such as propane