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3. What kinds of phones are the subject of this update?
The term "wireless phone" refers here to handheld wireless phones
with built-in antennas, often called "cell", "mobile", or "PCS"
phones. These types of wireless phones can expose the user to
measurable Radio Frequency energy (RF) because of the short
distance between the phone and the user's head.
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
energy (RF) 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 don't know with
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