The first reason I think cell phones should be allowed at school is because is because because if there was a emergency you want to able to call your parents. I say this because if the school caught on fire you want to be able to call your parents.
The second reason is because you might get a emergency phone call from your parents. If you get a emergency phone call you might get have to go to the office or go home. If you didn’t have a phone you wouldn’t get an emergency phone call.
My final reason is that you could use it as a tool. In class you can use your phone as a caculator when it is needed,