How to set parental controls on your child's iPhone, to limit screen time with specific apps, websites, and purchases - Business Insider

You can set parental controls on your children's iPhone to regulate their screen time on apps and other features. Like computers, the iPhone can be set up with parental controls that let you specify exactly what your kids can and can't do with their iPhones. ....
https://www.businessinsider.com/how-to-set-parental-controls-on-iphone