The alternative solution is to not give your kid a phone at all. Having been down the cat and mouse games with blocking, I can tell you that’s the only thing that works. The problem is that most schools require technology use, paper maps and public phones are non-existent, social pressure, etc. Pinwheel is the most nerfed smartphone for parents who want to limit their kids phone use but it’s a weird subset of Android, doesn’t nicely fit into Apple ecosystems, but effective if you need that.