The phone is a tool that people use in everyday life. Used to work or communicate. Today it is used widely. Bring innovation to create more comfortable. But there are problems, the key is to stick to my game or social. As a result, a dramatic example of the lack of patience, lack of selectively ignore the people around them, etc., also affect the body. The correct behavior using my phone. Should realize the pros and cons to it. And adjust to fit because I was a teenager, an indication of the progress of the