Although many people argue that students should be banned from using cell phones in school, I think they should be allowed to have them.
First of all, say, a students need help on a certain problem but the teacher is busy helping another student, busy grading work, talking to another teacher, or is not in the room at the time. The student then should be able to use his or hers phone to help them.
Another reason, is that students need to be able to call a family member or someone else in case of an emergency. Say that the student forgot something or had an accident, they should be able to call in private and not get embarrassed or feel weirded out.
Lastly, students should be able to play around on their phones during lunch or free time. I know some people will argue otherwise on this topic but kids shouldn't be crammed with work for 8 hours a day for 5 days a week. If you try and force them to focus on one class after another with no breaks, they won't be able to remember much. You dont have to give the students a long time to mess around but like 5 to 10 minutes to clear their brain for more information. I know that a bunch of students could back up this opinion.
In conclusion, I think students should be able to use their phones in class and have them during the school day.
I hope this works :D
