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These RF exposures are limited by FCC safety guidelines that were developed with the advice of the
FDA and other federal health and safety agencies. When the phone is located at greater distances
from the user, the exposure to RF is drastically lower because a person’s RF exposure decreases
rapidly with increasing distance from the source. The so-called “cordless phones,”which have a base
unit connected to the telephone wiring in a house, typically operate at far lower power levels, and
thus produce RF exposures far below the FCC safety limits.
4. What are the results of the research done already?
The research done thus far has produced conflicting results, and many studies have suffered from
flaws in their research methods. Animal experiments investigating the effects of Radio Frequency
(RF) energy exposures characteristic of wireless phones have yielded conflicting results that often
cannot be repeated in other laboratories. A few animal studies, however, have suggested that low
levels of RF could accelerate the development of cancer in laboratory animals. However, many of
the studies that showed increased tumor development used animals that had been genetically
engineered or treated with cancer-causing chemicals so as to be pre-disposed to develop cancer
in the absence of RF exposure. Other studies exposed the animals to RF for up to 22 hours per
day. These conditions are not similar to the conditions under which people use wireless phones,
so we do not know with certainty what the results of such studies mean for human health. Three
large epidemiology studies have been published since December 2000. Between them, the studies
investigated any possible association between the use of wireless phones and primary brain cancer,
glioma, meningioma, or acoustic neuroma, tumors of the brain or salivary gland, leukemia, or other
cancers. None of the studies demonstrated the existence of any harmful health effects from
wireless phone RF exposures. However, none of the studies can answer questions about long-term
exposures, since the average period of phone use in these studies was around three years.
5. What research is needed to decide whether RF exposure from wireless phones poses a health
risk?
A combination of laboratory studies and epidemiological studies of people actually using wireless
phones would provide some of the data that are needed. Lifetime animal exposure studies could
be completed in a few years. However, very large numbers of animals would be needed to provide
reliable proof of a cancer promoting effect if one exists. Epidemiological studies can provide data
that is directly applicable to human populations, but ten or more years follow-up may be needed
to provide answers about some health effects, such as cancer. This is because the interval between
the time of exposure to a cancer-causing agent and the time tumors develop — if they do — may