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The National Institutes of Health participates in some 
interagency working group activities, as well.

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. FCC relies on FDA and other health agencies 
for safety questions about wireless phones.

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 primary subject of the safety questions 
discussed in this document.

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 absence of RF 
exposure. Other studies exposed the animals to RF for up