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The term "wireless phone" refers here to hand-held wireless phones with

built-in antennas, often called "cell," "mobile," or "PCS" phones. These

types of wireless phones can expose the user to measurable

radiofrequency energy (RF) because of the short distance between the

phone and the user's head. These RF exposures are limited by Federal

Communications Commission safety guidelines that were developed

with the advice of 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 radiofrequency 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 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

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