Don't Want to Upgrade to iOS 26? Here's How to Stay on iOS 18 [Update: Now Unavailable]

Since the beginning of December, Apple has been pushing iPhone users who opted to stay on iOS 18 to install iOS 26 instead.
Techno-Science.net

iOS 26 Supported Devices: Which iPhones Will Get iOS 26

Apple iOS 26 will be available on all iPhone 11 or later models, including the 1st and 2nd generations of SE models. You can download and install iOS 26 developer ...

When does iOS 26.2 drop? Why Apple recommends updating to iOS 26 now

Apple is changing its tactics and recommending that iPhone users update to the latest version, rather than leaving it as optional.

Is iOS 26.2 out yet? Why Apple recommends iOS 26 update for AI, security

Are you still running iOS 18? Apple recommends updating to the newest system. Here's when iPhone users can expect iOS 26.2 to ...