You may not have heard of Tawkon before but they are the company responsible for the below inforgraphic and applications for iOS and Android that measure radiation output of your phone. The application was removed from the App Store since it doesn't make the iPhone look too good but is still available from the Google Play Store.
As you can see the Blackberry Bold 9700 isn't too far from reaching the maximum exposure limit, while the iPhone 4S isn't far behind the Blackberry. The Galaxy S III gives off the least amount of radiation by a considerable amount, more than 3 times less than the iPhone.
KitGuru says: If you're a heavy talker and worry about cellphone radiation, buy a Galaxy S III.
Great job ! thanks for the info