denying smartphone basically makes your kid an outcast, which might be fine for some kids, not fine for others, but ignoring that, the school basically requires smartphones, even uses apps to open the lockers, or to communicate about group projects.

apple's parental controls are total joke, per app blocks are not good at all, what you want is content type blocks, which of course is impossible.

example: https://discussions.apple.com/thread/254480754?sortBy=rank