Samsung SGH-T479, User Manual

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. 
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 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 
existence of any harmful health effects from wireless phones 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. 
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 be many, many 
years. The interpretation of epidemiological studies is hampered by 
difficulties in measuring actual RF exposure during day-to-day use of 
wireless phones. Many factors affect this measurement, such as the angle 

at which the phone is held, or which model of phone is used.