iPhone screen wallpaper turned black

Hello irmelis123,

Welcome to Apple Support Communities. What is the exact iOS 16 version installed on your iPhone? Settings > General > About.

iOS 16.2 is the latest iOS version, so if you haven't updated yet, please back up your iPhone, update, and test this behavior. Here's how to back up, and update your iPhone: Update your iPhone or iPad

Each update has several items that are addressed, both improvements and fixes. 

Does the issue persist after restarting your iPhone? Restart your iPhone

Restarting is a simple step that can resolve many unexpected behaviors.

Does the issue persist if you change the wallpaper on your iPhone? Here's how: Change the wallpaper on your iPhone

This will help us isolate this issue further.

We hope this information is useful. Kind regards.