In this report "the health risks are buried in the fine print".
This is what I have heard of the way they determined how much frequency or the max set for safety limits . The engineers used a model of a healthy 22 year old male skull and filled it with fluid and then put a phone to it and when the frequency was at a level that started to heat the fluid that is the highest recommended allowed.
Manufacturers build phones that are a few decimals below 100% of that max level.

Another thing buried in the fine print is to hold the phone an inch away from your head.

The thing I think is most important is that childrens skulls are not as thick as a healthy young adult. I would warn parents of this potential risk particularly for pre-teens.

Commentary from Scientific American
Major Cell Phone Radiation Study Reignites Cancer Questions
http://www.scientificamerican.com/art...