For apps like Messages or FaceTime, you need to edit the 'Always Allowed' section of Screen Time to remove them for the limit to be enabled. There is no option to turn off access to the Phone app at all. You can passcode lock any app on your phone except for the Phone app. There's no way to immediately lock it again after approving it for 15 minutes without redoing the entire App Limit setup, so keep that in mind. You'll need to put in your passcode, and then once you do, you can unlock it for 15 minutes, an hour, or the rest of the day. Once you have App Limits in place to lock apps you want to be inaccessible, you can tap on 'Ask for More Time' to access the app. There is no way around the passcode, which prevents anyone who has access to your iPhone from opening up and using the app that's been passcode blocked. You can continue to use the app for one minute, but after that, you'll need to enter your Screen Time passcode to continue to use the app. When the time limit that you've set expires, you'll be told you've run out of time. Otherwise, exit the Screen Time interface. If you want to add additional apps, go through the 'Add Limit' steps again.At the slider where you select the time, choose 1 minute.Tap on the app that you've picked and then tap Next.If you want to lock the ‌Photos‌ app, it's in the 'Creativity' category. Tap on App Limits and Tap on the Add Limit option.Make sure Screen Time is enabled and a Screen Time passcode is set by choosing the 'Use Screen Time Passcode' option.If you want to make sure one of your apps is inaccessible, you can use Apple's Screen Time App Limits feature to do so. This article explains how it's done, but if your device is running iOS 16.4 or later, you can use a new Lock Screen action to lock specific apps behind FaceTime or your iPhone's passcode, which is arguably the more secure method. Apple doesn't have an official method for individually locking sensitive apps like Photos with a passcode, but there is a workaround that was introduced with the Screen Time feature that first came out in iOS 12.

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