Indiana just passed legislation to require schools to ban phones.
They permit them for health reasons, emergencies, when part of lesson, and when part of a formal plan.
I personally don't like the idea of schools requiring locking them up. What would you do in that emergency they mentioned?
Why should kids not be able to use them at lunch?
If you want to control your kid's phone time, there's already apps for that.
Edit: additional comment from a teacher: she said the phone restrictions aren't going to be as effective as one would think with all the kids having watches with data plans. Dude...