How do I fix disappearing background images on iPhone in iOS 27 and 27.0.1?

If you are experiencing an issue where your Lock Screen or Home Screen background image keeps disappearing or reverting on its own, I would first test it using one of the built-in wallpapers that came with iOS 27.

Set an Apple-provided wallpaper and use the iPhone normally for a while to see whether the problem occurs again. This is a useful troubleshooting step because it can help determine whether the issue is related to iOS itself or to the particular photo/wallpaper you are using.

If the built-in wallpaper remains intact but your selected photos continue to disappear, the problem is more likely related to the Photos app, the particular image, iCloud Photos syncing, or how that photo is being selected/applied. On the other hand, if even Apple's built-in wallpapers disappear or change unexpectedly, that would point more toward an iOS or Lock Screen configuration issue.

Testing with Apple's original wallpapers is therefore a simple way to isolate the source of the problem before making more extensive changes to the iPhone.

1. Is this your corporate/organisation/enterprise/School Management iPhone? Then please contact the system administrator of your corporate//organisation/enterprise/School Management
2. If it is your device, in that case, do you have any profile installed by your corporate/organisation/enterprise/School Management?
   1. Erase the profile added by you If you have installed a profile on your own --> Install or remove configuration profiles on iPhone - Apple ...
   2. Or please contact the system administrator of the organisation who provided the profile to you

A corporate profile installed on your iPhone could potentially be contributing to the inaccessibility of certain features. 

Here's why:

• Restrictions: Corporate profiles can have restrictions placed on apps and functionalities. These restrictions might be limiting some activity, causing it to be unresponsive or quit.
• Managed Apps: IT departments might deploy specific navigation apps through the profile, potentially blocking certain functions or features.
• Security Settings: Corporate profiles often have stricter security settings that could affect app or function behavior. This might be causing unexpected behavior of an App or functions.

Here's what you can do:

• Check with IT: The best course of action is to contact your IT department. They can explain the restrictions set by the corporate profile and see what is affected. They might be able to adjust settings or suggest alternative apps or features approved for corporate use.
• Look for App Conflicts: See if your IT department uses a different app through the corporate profile. Conflicting apps might cause crashes.

Additional points to consider:

• Even if the profile isn't directly affecting the function, it's still a good idea to check with IT. They might be aware of similar issues and have workarounds.
• While troubleshooting, make sure you prioritize safety. Don't fiddle with your phone. 

By working with IT and considering these possibilities, you can hopefully identify if the corporate profile is the culprit and find a solution that allows you to use the iPhone to your liking.