These features exist! Apple includes parental controls under "Screen Time" and they works very well. You can whitelist contacts and websites, and even extend th

These features exist! Apple includes parental controls under "Screen Time" and they works very well. You can whitelist contacts and websites, and even extend them remotely, as an administrator of a child's device. For restricting access to the internet: https://support.apple.com/en-us/HT201304 https://support.apple.com/en-us/HT201304 For restricting access to contacts: https://support.apple.com/guide/iphone/set-up-screen-time-for-a-family-member-iph7f15d92dd/ios https://support.apple.com/guide/iphone/set-up-screen-time-fo...