Monitoring and Restricting Your iPhone or iPad Use With Screen Time
A new feature of iOS 12 is the ability to view how much time you have spent on your iPhone or iPad and what you are doing wit that time. You can also restrict the amount of time you spend with apps, or turn off access to features of your devices completely. Screen Time can be used to help you spend less time on your devices or in certain apps. It can also be used to restrict usage of a device by a child.