http://cellphonesafety.wordpress.com/category/0317-wkg/ This is kind of scary!
I have a friend that works a nuclear power plant though. He was telling me that humans are able to withstand a certain percentage of millarads per year. Not sure how that translates into w/kg? I think it should be taken into consideration general use of the phones as well. I rarely talk on mine maybe 2o r3 times a day if that and only for 5 mins or less. So who knows. Its a good debate I suppose.