It won't give you cancer. What is coming out of your mobile is a radio wave. If you work it out (very logically) you calculate the power of those waveforms to be about 0.3W. What people worry about is that 0.3W of power heating up the water in your tissue, and destroying the cells. There is no evidence to support it, and if you compare it to the power of other waves that pass through you all the time, its nothing.
Wrong. Ted Kennedy would sorely disagree with you right now.
USE YOUR EARBUDS.