Luis G said:microwaves heats organic things.
So that's why my ear always gets sweaty when I talk on it. I thought it was because I closed up the phone over my ear preventing air from circulating and evaporating the sweat. 
Seriously, there's not enough microwave energy to produce any measurable harm to the human body in a cell phone today, over any period of time. Maybe back when they were first invented, but nowadays they've improved them quite a bit.

