How to treat young people who never leave their mobile phones?

People who don't leave their mobile phones are usually lonely in real life. They don't want to go out, stay at home all day, and don't want to actively communicate with others. So they can only find some friends to chat, play games, watch some interesting conversations and videos on their mobile phones, watch their mobile phones while eating, watch their mobile phones when crossing the street and indulge in the internet, which will cause great danger to their lives.