There are three reasons that I agree with using smart phones while you are studying.
The first reason is that we can know when our parents want to con tact us. Call this are very useful, but must know hot to use. We can the communication distance. We can help immediately if there are urgent.
The second reason is that we can search facts for each class. We can photograph news, surf the internet quickly and conveniently. We and lests work easier. May be able to use the computer. We can to send a message for the phone. It is the way to solve problems, too.
The most important reason is that we feel relax after we feel stress from study. Remind youself. We can reduce the noise down when used in place of the people want peace. We can carry it easily.
So, I agree that make it conveninent to use to find information and not disturb other.