The reason cell phone and wireless radiation doesn't cause problems is because it is non-ionizing. All that radiation can do is heat up particles, causing them to resonate. So if you were to get blasted by a cell phone tower, sure you might have some problems, but more along the lines of being microwaved.
Also Tesla did succeed in power transmission through the air, and through the earth. The only reason wireless power transmission didn't flourish was because his financial support noticed you can't easily make people pay for it. Tesla wanted electricity to be free, but the bankers and the like stopped that. Just now are they finally rediscovering Tesla's research it seems.