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According to some scientists, the radiation emitted by cell phones can raise some of your risks for brain tumors. It's not conclusive, but why take the risk?

The latest report on cell phone radiation from the Environmental Working Group ranks dozens of new and current cell phones and smartphones according to how much radiation they emit. The results vary by model and maker, sometimes shockingly so.

For example, Blackberry's Storm 9530 ranks as one of the best phones on the market, with a very low level of emissions. But the EWG also ranks the Blackberry 8820 as the worst phone on the market, with emission levels more than double that of the Storm.

You can see the EWG's full ranking of cell phones and smartphones here. They also offer a page of tips to reduce your radiation exposure.