I think mobile phone have many negative effect that you don't unforeseen. Today, we use the phone to each other so much because it convenient in communicating with each other. Just your finger touched down on the screen, you can contact the way across the continent or around the world. But in the other hand, if we use cell phones too much might pose a dangerous, as well. In addition, the use of cell phones may also affect mental health problems of users. For example, you can’t contact customer because signals have a problem or other problems it's make you dissatisfied. Which can result in mental health decline. So it's one big problem that we haven't been able to find a way out.