Radiation DOES have effects, but not at the levels you are seeing in your iPhone and surely not supported by any reputable research.
Here is your reputable research from the EWG.**
All PDAs/Smartphones ranked by radiation:
http://www.ewg.org/cellphoneradiation/Get-a-Safer-Phone?allavailable=1
Phones made by Apple, with service for AT&T:
http://www.ewg.org/cellphoneradiation/Get-a-Safer-Phone?query=iphone&provider_id=1&brand=Apple
** "The mission of the Environmental Working Group (EWG) is to use the power of public information to protect public health and the environment. EWG is a 501(c)(3) non-profit organization, founded in 1993 by Ken Cook and Richard Wiles.
In 2002, we founded the EWG Action Fund, a 501(c)(4) organization that advocates on Capitol Hill for health-protective and subsidy-shifting policies."
http://www.ewg.org/about