You can update your iPhone to iOS 26 for free right now - here's which models support it

The latest update to the iPhone has arrived, bringing a fresh user interface design, improved calling features, and more.
PC Magazine

Make Sure You Really Want iOS 26. There's No Going Back to iOS 18

Without this check, you can’t install a software update on your iPhone. Since Apple has stopped signing iOS 18.6.2, it just means you can’t go back to iOS 18 once you upgrade to iOS 26. For those on ...