Install iOS 13.3.1 for Upgrades to Screen Time
If you use the Screen Time feature to monitor your kids activity on their iPhone, and you skipped iOS 13.3, you'll probably want to download iOS 13.3.1 update in the near future.
The iOS 13.3 update included a new feature called Communication Limits for Screen Time. This allows parents to control who their children are able to contact via apps like FaceTime, Phone, and Messages.
There's also a contact list for children that lets parents manage the contacts that appear on their children’s devices.
It's also worth noting that calls to emergency numbers (like 911) are always allowed. When a call to an emergency service is placed, the device will shut off communication limits for 24 hours to ensure that the child is safe.
If this sounds useful to you, and you missed iOS 13.3, consider moving to iOS 13.3.1. It'll have these features on board.