Posted Facilities; Potentially Explosive Environments - Samsung Galaxy S4 User Manual

Other Medical Devices
If you use any other personal medical devices, consult the
manufacturer of your device to determine if it is adequately shielded
from external RF energy. Your physician may be able to assist you in
obtaining this information. Switch your mobile device off 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. Check with the manufacturer
or its representative regarding your vehicle before using your mobile
device in a motor vehicle. You should also consult the manufacturer
of any equipment that has been added to your vehicle.

Posted Facilities

Switch your mobile device off in any facility where posted notices
require you to do so.

Potentially Explosive Environments

Switch your mobile device off 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 the mobile device off
while at a refueling 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
425