How to update iOS 15 on iPhone 11?

Hello,

There are different ways to ensure the highest iOS that your device will support is installed on your device. When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date (and can't go any higher) and won't install anything.

iPhones XS, SE (gen 2 or later), and higher will update to iOS 17.4

This support article has instructions about updating an iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support Read the article for recommended criteria for being able to use wireless updating.

You can also use Mac and PC computers to update system software --> Update iOS on iPhone - Apple Support

If you want a video about doing this, follow this link —> https://www.youtube.com/watch/1FcE86kwODQ

Apple no longer allows units capable of 17 to be updated to an intermediate OS.

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How to update to iOS 15

Read the answer just above your post.