It'd be kind of neat if the phones had a mode similar to the "car mode" on Apple phones, where it goes into a DnD mode and becomes inconvenient to unlock and use when at a certain location. So a kid can use the phone, but texting or other features are harder to access in a non-obvious manner and notifications are muted. Almost like being in Airplane mode by default except during in between class breaks.

They are useful tools, but even outside of school they constantly suck away our attention, and apps are designed for this, the constant distraction needs to be curbed, not their use as a pocket computer.