Actually, I agree with Skybird.
Mobile or Cell phones, call them what you will... are based on microwaves, the same microwaves that cook your ready meals... that means you are putting a microwave device right next to your head. This is why I prefer to text!
Although the exposure is very very low there is no concrete answers as to what years and years and years of exposure to it will do to you. I think if you want to compare this to smoking as it stands now on research its probably less dangerous than smoking.
Although... one bit of advice if ever you are out in the thunderstorms, do the sensible thing and turn your phone off... lightning can ride the signal right down to you, that would be a shocking a experience.
