Even if cell phones produce some sort of harmful radiation (big if) you're still screwed because that radiation is around you 24/7 anyway. You could stand right next to me right now and receive a call from your phone because the radio waves carrying that transmission would surround you here save as they would where you are. (Note - this would not work if you're with ATT 'cuz you can't make calls with them.)
Your phone emits very low levels of microwave radiation. The FCC determines how much is allowable and all manufacturers must comply. The radiation is intermittent unlike your microwave oven.
Microwave radiation "falls off" at a certain point. So we might be standing next to each other, and what comes from your phone is likely so diminished, it does not have an effect.
To be fair, lots of sites with lots of data that agrees with me or if not, clearly, it is wrong. Smiley. The tinfoil gamete industry is growing because of these issues. We all know that cell phones will cause your wife to give birth to Flipper.
From an FCC web site:
OET -- RF Safety FAQ's
"A number of devices have been marketed that claim to "shield" or otherwise reduce RF absorption in the body of the user. Some of these devices incorporate shielded phone cases, while others involve nothing more than a metallic accessory attached to the phone. Studies have shown that these devices generally do not work as advertised. In fact, they may actually increase RF absorption in the head due to their potential to interfere with proper operation of the phone, thus forcing it to increase power to compensate."
While you are fretting so, consider that your wireless phone in the home also generates microwave radiation. Well, mine does. And there is a chance that some of those gathered here have radon issues that are real issues because radon is a bad thing.