Apple's screentime limits do not work on my daughter's phone. I have spent more than a year fighting this, with increasing failure. I know what you are meant to do, I've spoken to Apple help, I've been into stores and been on forums. It works for DS (11yo) but not for DD (just 14yo). Apparently teenagers have "privileges" on screentime. Apple are actually screwing up children by making it so apparently easy for her to breech the limits.
ANYWAY, what is the best 3rd party option for controlling smartphone use - which must work with iPhone as we all have them.
PLEASE do not tell me your children were given unfettered access to their phones and self regulated beautifully, volunteered for charity, got straight As and are polite, kind and active model citizens. I will hate myself more and it is not kind. That is a statistical sample of one (child/family) and Will Not Work.