As for cell phones, I wouldn't be surprised if they can cause cancer or other similair effects.
I worked as system technician in the navy while enlisted aswell as after. Main thing was to repair and maintain radar equipment, we're talking the high efficency long range kind of stuff here, not some meesly cell phones. So I know what the micro waves are capable off

During the training we were shown photos of people who had worked with cell phones in the pockets while in basements and similair for several days or weeks and the pictures weren't all that pretty, most of them hade burn marks where the cell phone had been. Another photo showed one guy who had talked several hours a day for a few years, he had no hair left on the entire side of the head + burn marks.
So people saying it doesn't do any harm are only stupid.