Smartphones are one of the most wonderful inventions of human. It helps people, especially students in a lot of aspects including calls, works, study. First of all, students can use their smartphones to communicate with people all around the world. Only with a smartphone connected to the Internet can they make friends with other people from different sides of the world, learn about their cultures and enrich their own knowledge. Second, we can relax by using smartphones. We are able to listen to some pieces of music or play games to reduce stress and pressure. Last but not least, students can use smartphones to make money as they can use social media to advertise and sell products online to make profit. In short, besides calls, students can use smartphones to study, relax and earn money.