We should have known the dangers of listening to the phone for too long. When we're cool calling relatives or anyone, by itself the danger of mobile phones come to us. The radiation emitted by mobile phones is terrible.
Radial itself can cause cancer users. Even until there is a death. For parents, it's time to watch our children from the dangers of using mobile phones. For more secure, if we want to call longer, use the headset as your tool.
Besides that, if using a headset, at least we will avoid the hot radis directly about our bodies.