This article explains how to turn off parental controls on iPhone. There are two types of parental controls on iPhone: Screen Time and Content Restrictions. Screen Time offers a broader set of controls, of which Content Restrictions is just one. This information applies to iPhones running iOS 12 and later.
The iPhone's built-in parental controls are a great tool for parents to keep their kids safe, but as your kids get older, you'll likely want to adjust the settings to give them more options. Whether you need to adjust them or turn them off altogether, here's how to turn off parental controls on your iPhone.
Tap Settings > Screen Time.
Tap Content & Privacy Restrictions.