Re: inverse square law and all that
The EM radiation of a cellphone is absorbed by the skin and does not penetrate further into the body. The skin is (slightly) heated, which appears to be completely harmless, at least at the levels emitted by your iphone. Swallowing your phone is thus not recommended as it will lead to bad reception. Also make sure you are not holding it wrong.
 As demonstrated by countless studies, which you may want to believe where all funded by the big conspiracy for corrupting our precious bodily fluids.