Samsung GALAXY S3 Owner's Manual page 41

Cell phones emit low levels of Radio Frequency
(RF) energy. Over the past 15 years, scientists
have conducted hundreds of studies looking at the
biological effects of the radio frequency energy
emitted by cell phones. While some researchers
have reported biological changes associated with RF
energy, these studies have failed to be replicated.
The majority of studies published have failed to show
an association between exposure to radio frequency
from a cell phone and health problems.
The low levels of RF cell phones emit while in use
are in the microwave frequency range. They also
emit RF at substantially reduced time intervals when
in the stand-by mode. Whereas high levels of RF can
produce health effects (by heating tissue), exposure
to low level RF that does not produce heating effects
causes no known adverse health effects.
The biological effects of radio frequency energy
should not be confused with the effects from other
types of electromagnetic energy.
Very high levels of electromagnetic energy, such
as is found in X-rays and gamma rays, can ionize
biological tissues. Ionization is a process where
electrons are stripped away from their normal
locations in atoms and molecules.
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