LG Lucid VS840 Owner's Manual page 196

Safety
194
Persons with pacemakers:
Should ALWAYS keep the phone more than six (6) inches from their
pacemaker when the phone is turned ON;
Should not carry the phone in a breast pocket;
Should use the ear opposite the pacemaker to minimize the potential for
interference;
Should turn the phone OFF immediately if there is any reason to suspect
that interference is taking place.
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 (or
call the customer service line to discuss alternatives).
Other Medical Devices
If you use any other personal medical device, 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.
Health Care Facilities
Turn your phone OFF in health care facilities when any regulations posted in
these areas instruct you to do so. Hospitals or health care facilities may use
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. You should also consult the
manufacturer of any equipment that has been added to your vehicle.
Posted Facilities
Turn your phone OFF in any facility where posted notices so require.