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It's just not relevant. When I was in highschool some teachers had a thingy on the wall where you would hang up your cell phone in a pouch. If it wasn't there, you better have a good explanation, or you'll be counted absent.

The solutions are simple and effectively free. That's not the issue. The issue is nobody wants to do the solutions. Schools don't, parents don't, kids don't. Everyone is just lying to themselves.

You can't on one hand claim to care about kids and then on the other dismiss obvious tactics like banning cell phones.