The school made the rule to tell the students, that we should use our mobile phones only in lunch breaks and dismissals and not during class hours. They made the rule because some students are watching pornographic videos during class hours and some students are playing during class hours, the teacher notice their watching and playing so the students went to office, so that’s why they made the rule to not disobey the teachers.
The advantage of the rule is to keep the students away from the technologies during classes so the students will listen to the teachers discussion so that the students will have a high grade. But the disadvantage of the rule is that the parents will have to discuss or talk to the teachers. The parents will argue that “why do students have to surrender their phones during class hours? they can put their phones in their bag.” so their will be a fight between the teachers and parents.
The problem is the teachers and parents are arguing about mobile phones but the best solution is the rule of the school, because the students will concentrate on their studies and not their mobile phones.