Samsung A420 - Manual (Page 149)

Section 4A: Important Safety Information 133
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Following Safety Guidelines
To operate your phone safely and efficiently, always follow any special
regulations in a given area. Turn your phone off in areas where use is
forbidden or when it may cause interference or danger.
Using Your Phone Near Other Electronic Devices
Most modern electronic equipment is shielded from radio frequency (RF)
signals. However, RF signals from wireless phones may affect inadequately
shielded electronic equipment.
RF signals may affect improperly installed or inadequately shielded
electronic operating systems and/or entertainment systems in motor
vehicles. Check with the manufacturer or their representative to
determine if these systems are adequately shielded from external RF
signals. Also check with the manufacturer regarding any equipment that
has been added to your vehicle.
Consult the manufacturer of any personal medical devices, such as
pacemakers and hearing aids, to determine if they are adequately shielded
from external RF signals.
Turning Off Your Phone Before Flying
Turn off your phone before boarding any aircraft. To prevent possible
interference with aircraft systems, the U.S. Federal Aviation
Administration (FAA) regulations require you to have permission from a
crew member to use your phone while the plane is on the ground. To
prevent any risk of interference, FCC regulations prohibit using your phone
while the plane is in the air.
Note: Always turn off the phone in health-care facilities and request
permission before using the phone near medical equipment.