Why can't students be able to bring their cell phones to school?

Students are not allowed to use their cell phones in school why? Because they can’t concentrate in their class work, and teachers would get mad at them if they use them in class and also they going to take them alway and that’s not a good idea.I think students are not supposed to bring them to school, but also i think that they might bring them because what if their parents need something they might need to call them.

Cellular phones in schools are a problem too, because students are using them a lot and most of them couldn't imagine living without a cellular phone. Students can be cheating during exams, they can also store any information they want on their cellular phone. Also cell phones are a distraction in class and not everyone remember to turn off their phone during class. And people be stealing cell phones in school and thats why is not a good idea to bring them to school.

Also its not a good idea to bring them to school, because it distracts us students, for example they use them during class to text or talk, but also i think they should bring them to school in case of a emergency but they need to have them in silence or in vibration so when the teacher its explaining something in class that doesn't make any sound.