I work on the flight deck of an aircraft carrier, and expose myself to so much more rf than you could ever expose yourself to in your entire life using a cell phone, in a single day. So much in fact all the children I can father will be female, ( it appears male sperm is the weaker). I am more likely to be struck by lightning than to catch cancer from that rf. I seriously doubt that puny signal from your phone will ever harm you, but you keep spreading the rumor so when you get cancer from somewhere else you can file a frivalous lawsuit, its the american way.