The effects of devices that radiate like cell phones, radio transmitters, etc. have been extensively studied for decades. All valid studies concluded that there were no side effects from using these devices. Does that mean they are totally safe? At least with what we know to look at and test for they appear to be safe. Also given the millions of people using these devices if there were serious side effects they would have shown up already in epidemic proportions. Time and how we advance technologically will ultimately determine if cell phones are a concern in regards to human health.