I'm very wary of things I cannot see, like sound waves and things in the "air", or things that have not been tested on many people for a long period of time. Not just cellphones but saturation from wireless access points as well.
http://www.apple.com/legal/rfexposure/iphone5,1/en/and how do they really know what the effects are long term, or how one individual may be more susceptible than another?
My guess is that these same people believe that tap water is good enough.
O.K. SI one more area of learning. Does it ever end? LOL Now i will have to check out ratings...but it is a little late for that with my own phone. Suppose i can keep it away from my body more often though!