CNN most recently reported that the radiation from cell phones can possibly cause cancer, according to the World Health Organization. The agency now lists mobile phone use in the same “carcinogenic hazard” category as lead, engine exhaust and chloroform.

A team of 31 scientists was set up for reviewing peer-reviewed studies on cell phone safety. The team found enough evidence to categorize personal exposure as “possibly carcinogenic to humans.”

Now how is this related to the iPhone and what are its impacts?

The iPhone 4 rated 1.17 watts per kilogram, just below the 1.19W/kg of the iPhone 3GS. The older iPhone 3G has a lower radiation rate of 1.03 W/kg. The FCC’s legal limit for SAR on a mobile devices is 1.6 W/kg.  The phone with the lowest rated radiation emissions was an LG Quantum with just 0.35 W/kg. The phones with the most radiation were the Motorola Bravo & Motorola Droid 2 Global, at  1.59 W/kg and 1.58 W/kg respectively.

Apple advices its customers to keep the phone at least 15mm away from the body when communicating. The WHO suggests people to use headphones and recommends that you keep your mobile phone in a purse/backpack/suitcase or anything else that avoids direct body contact.