Using cell phone too much

I think there must be many serious impacts of using cell phone too much in our physical and mental health. First of all, when I use a cell phone too much, my neck should be bent and of course, it give a big stress. Because I am interested in workout, I\'m also getting interested in human body. I\'ve read an article about an abnormal neck shape because of using cell phone. It would make a lot of different serious impacts on the other body parts. Moreover, eyes would be bad because we have to watch a screen a long time and it also gives a big stress in my eyes. Even though there has been a big improvement in display technique, I think it cannot change a fact that screen is not good for our eyes. I know cell phone became a necessary part in our life but we need to control and be concerned about how many hours we use cell phone