U.S. FDA
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How much evidence is there that hand-held mobile
phones might be harmful?
Briefly, there is not enough evidence to know for sure,
either way; however, research efforts are on-going. The
existing scientific evidence is conflicting and many of
the studies that have been done to date have suffered
from flaws in their research methods. Animal experi-
ments investigating the effects of RF exposures charac-
teristic of mobile phones have yielded conflicting re-
sults. A few animal studies, however, have suggested
that low levels of RF could accelerate the development
of cancer in laboratory animals. In one study, mice ge-
netically altered to be predisposed to developing one
type of cancer developed more than twice as many such
cancers when they were exposed to RF energy com-
pared to controls. There is much uncertainty among sci-
entists about whether results obtained from animal
studies apply to the use of mobile phones. First, it is un-
certain how to apply the results obtained in rats and
mice to humans. Second, many of the studies showed
increased tumor development used animals that had al-
ready been treated with cancer-causing chemicals, and
other studies exposed the animals to the RF virtually
continuously – up to 22 hours per day.
For the past five years in the United States, the mobile
phone industry has supported research into the safety
of mobile phones. This research has resulted in two
findings in particular that merit additional study:
