Find the software version on your iPhone, iPad, or iPod - Apple Support

Official Apple Support

If you can't update or restore your iPhone or iPod touch - Apple Support

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

iPad User Guide - Apple Support

How to uninstall iOS or iPadOS beta software - Apple Support

How to update software on iPhone and iPad - 9to5Mac

If your iPhone or iPad won't update - Apple Support

About software updates for Apple devices - Apple Support

Update iOS On Your iPad, iPhone or iPod Touch Wirelessly

Update HomePod - Apple Support

How to Find What iOS Version is on iPhone or iPad

Find your apps in App Library on iPhone - Apple Support

Use Tags and Smart Folders in Notes on your iPhone and iPad - Apple Support