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What Kind of Harm Can Cell Phone Radiation Cause?
There’s no argument that cell phones emit an electromagnetic field, which is a form of microwave radiation, that enters the brain when the cell phone is held against the ear, and there’s good research showing that the field does affect brain function. (See Research section below.) Although research has not shown that short term cell phone use causes cancer, a large population study has shown that people who use cell phones for more than ten years on the same side of the head have a 40% higher risk of certain types of brain tumors.

Research on other effects of cell phone radiation on the brain is scant and we need more. The bottom line is that we know long-term cell phone use can increase the risk of some brain tumors, but that much more research needs to be done on other types of potential harm caused...

http://emfnews.org/Lifewave-Cellphone-Matrix-Shield-Test.html