Never, forget it! In this century, humans are so much attached to gadgets that it's hard for them to be separated. Mobile Phones began as devices for simple voice communication, but today, the uses it's got are so interesting that it almost has become impossible to stay away from it. But, a bit of advice, over use of mobile phones has a bad effect on health.
While talking over the phone, use your left ear rather than the right, as it affects your brain!