nowadays, more and more people are addicted to using smartphones. If someone abuse of using smartphones, it will damage him both in mind and physics. So I can't emphasize the significance of using smartphones wisely too much. Firstly, as a student, we should not use smartphones when we having a class. Because if we use it, we can't concentrate on what teachers say. Besides, it is also a disrespectful behavior to teachers. From my perspective, the phone is one of the greatest inventions in the world. It breaks the barrier of time and space. We can communicate with others more convenient. With the rapid development of society, people become more and more busy. We may not have enough time to chat with friends and relatives face to face. But due to the invention of smartphones, we can hear their voice, see their face easily. Furthermore, there are so many different kinds of resour...