“The effects of long-term exposure to wireless technologies including emissions from cell phones and other personal devices, and from whole-body exposure to RF transmissions from cell towers and antennas is simply not known yet with certainty. However, the body of evidence at hand suggest that bioeffects and health impacts can and do occur at exquisitely low exposure levels: levels that can be thousands of times below public safety limits.” (BioInitiative Report)

"There are a number of scientific findings from investigations on sub-populations with an elevated exposition to high frequency electromagnetic fields and from animal experiments that have to be taken seriously. These findings point on a cancer-promoting effect of high frequency electromagnetic fields used by cellular telephone technology. Experiments on cell cultures yielded clear evidence for geno-toxic effects of these fields, like DNA breaks and damage to chromosomes, so that even a cancer-initiating effect cannot be excluded any longer…" 
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Consistent epidemiologic evidence of an association between childhood leukemia and exposure to extremely low frequency (ELF) magnetic fields has led to their classification by the International Agency for Research on Cancer as a “possible human carcinogen.” Read more