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group activities, as well.
The FDA shares regulatory responsibilities for wireless phones with the Federal
Communications Commission (FCC). All phones that are sold in the United
States must comply with FCC safety guidelines that limit RF exposure. The
FCC relies on the FDA and other health agencies for safety questions about
wireless phones.
The FCC also regulates the base stations that the wireless phone networks
rely upon. While these base stations operate at higher power than do the
wireless phones themselves, the RF exposures that people get from these base
stations are typically thousands of times lower than those they can get from
wireless phones. Base stations are thus not the subject of the safety questions
discussed in this document.
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 (RF) energy
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 (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
