Earlier quoted context omitted.
Or maybe... just don't give your kids an iPhone? Seriously, using the internet/computers should be treated with the same level of caution as grown-up scissors or fillet knives; powerful tools, but they need training to avoid hurting yourself with them. If this is what you're worried about, why are you even giving them a small computer in the first place? Your kids will always be more cunning than your security policy…
You don't have kids. Your child would be the only one at school with no phone and probably be pretty embarrassed about it.
Kids being embarrassed at school is unavoidable, being embarrassed is practically the job description of a teenager and younger students often have their own insecurities. There's an interesting debate as to whether these embarrassments are good or bad for us in the long run but we can side step all of that... not having access to a smartphone is important - it's important enough to warrant the slight amount of embarrassment.