And now the disadvantages, the first one is that you can lose contact with your family, for example, if you are in the living room with your family and you are with the phone, you lose time which you could be talking with them. Another one, is that with smartphones you lose focus and that disadvantage is scientifically proven. Also, if you are very obsessed with it, you spend less time outside and that generates less time with your friends. If you're focused only with your smartphone you can waiste your lifetime.
In conclusion, although is a good new invent, provoques you a lot of waiste of your time, and you have to live your real live!!