Normally, students play mobile phones to make students free, which is no problem, but students can't control themselves because they are still young, let alone students. Even if they go to graduate school, you may not be able to completely control yourself, but most of them know when to relax and what to do. Maybe people in junior high school and high school don't understand it that much, because his three views are not good and he doesn't know much.
In fact, the impact on students is not great. Students are not allowed to play mobile phones only when they are nervous at school, that is, they go home for one or two days a month, so it will not have any bad influence on their academic performance. School is originally a place to study, and children should not be allowed to bring their mobile phones casually. The child can't control himself. He doesn't know what effect his study will have on his future, but the teacher knows, the school knows and the parents know. You should create a good learning environment for your children within your ability.
In order to make their students study hard, the school can be said to have taken great pains, because if the school does not make such regulations, students may do whatever they want. On the one hand, the school takes into account the school atmosphere, and some children want to learn and cannot be influenced by others. On the other hand, it is also a good direction to let every child do what he should do at that age when his outlook on life is uncertain.