Considering the amount of electromagnetic radiation that zaps through us every day -- from sunshine to radio waves to microwaves from communication towers to the wayward offspring of the electrical wiring in our homes and offices -- I am not worried about a bit more from my cell phone.
These days I've been forgetting to turn it on until after noon anyway...and besides, nobody ever calls me because nobody loves me and everybody hates me. And as I said, recently I've taken to no even turning it on.