I'm also skeptical about brain tumors being causes by cell phones.
Some people like to talk about how so-and-so got a brain tumor right where they hold their cell phone... yet we never hear of anyone getting hand tumors from a cell phone. Last I checked we hold the cell phone in our hand... and the hand is closer to the cell phone than the brain.
Regarding autism... the only reason the rates appear to be going up is because modern civilization is no longer killing the "demon possessed children".