When I was a young man in my 20s, I was running a business and I was quite proud of myself because we were doing fairly well, and for young man I was quite pleased with the monetary results each month. Indeed, I had one of the first cell phones, and I was paying between $.60 and a dollar per minute, and yet it seemed to pay for itself because of the inherent efficiency of rapid communication.
None of my competitors had a mobile phone yet, the best they had were those repeater phones were you had to push to talk, and they were much cheaper either. Needless to say, I was running over 1,000 hours per month on average.
Unfortunately, they didn't know back then all the know today about how dangerous cell phones could be to the biosystem. It turns out those phones back then operated on 3 Watts of power, no, that's not very much. But since the frequency of the cellular phones back then were in the microwave range, which they are today, that meant that I was holding the phone up to my ear, and that wasn't very good for the issues with cell phone radiation. Now then, my first phone sat underneath the seat of my vehicle, and it probably cooked the underside of my seat.
Later, I had a transportable phone which I walked around with, but again it was away from my body, so it was a little bit safer. Eventually I had a handheld phone when they finally got invented, which had quite a bit more power, but I held that unit up to my ear. Later on, about eight-years later, the cell phones started using less power and they went to a different system. The wattage was significantly less, as it is today, and therefore it's probably not too much of a problem as people hold this up to their ears, provided they are not using the phone a significant percentage of the time, let's say 500 plus minutes per month, but to be totally precise, you'd need to look at the data yourself.
However, people also commonly wore their cell phone on their belt. Those microwave frequencies can damage DNA, and the last place you'd want to put it is near your reproductive system, in fact you would not want it anywhere near. Nor would you want it next your brain, even though your skull could somewhat protect you. Remember microwave frequencies go through things; that's why your microwave oven has special shielding.
There was an interesting article recently in Kurzweil's Accelerating Intelligence Online News titled; "New Studies Reveal Evidence that Cell Phone Radiation Damages DNA, Brain, and Sperm" by the Editor posted on May 24, 2011. The article stated that a:
"New independent studies offer proof that confirms findings from the Council of Europe: pulsed digital signals from cell phones disrupt DNA, impair brain function, and lower sperm count, according to a statement by the EHT. It was found that four hours of exposure to RF-EMF disrupts the ability of human brain cells to repair damaged genes. Other new work from Australia shows damage to human sperm."
Brain cancer is quite serious, and so are things like Alzheimer, and other diseases of the brain. Your brain is your most important organ, and therefore you should be thinking, and playing it safe. Indeed I hope you will please consider all this and think on it.