I have been hearing from a lot of people that putting phone on the ear while talking can cause brain tumor. But I also studied in my physics class that phones emit non-ionizing radiation i.e. they do not have enough energy to rip the electrons out of the atoms and hence the probability of having a brain tumor due to the non-ionizing radiation emitted from phones is extremely low. So, is it just a myth that putting your phone on the ear while calling is harmful? Or is it really true? Can someone please explain? Also does putting your phone near you while you are sleeping cause diseases?