I found this interesting article of EWG:

Four billion people around the globe own cell phones. As the market for new devices has grown, so have concerns about the safety of cell phone radiation.

Recent studies find significantly higher risks for brain and salivary gland tumors among people using cell phones for 10 years or longer. The state of the science is provocative and troubling, and much more research is essential.

We at Environmental Working Group are still using our cell phones, but we also believe that until scientists know much more about cell phone radiation, it’s smart for consumers to buy phones with the lowest emissions.

The U.S. government ought to require cell phone companies to label their products’ radiation output so that consumers can do the numbers at the point of sale.

It doesn’t, so EWG has created this user-friendly interactive online guide to cell phone emissions, covering over 1,000 phones currently on the market.