Since the beginning of December, Apple has been pushing iPhone users who opted to stay on iOS 18 to install iOS 26 instead.
To update, go to the Settings app on the iPhone, click on General, then Software Update. Next, select Download and Install, ...
Apple is changing its tactics and recommending that iPhone users update to the latest version, rather than leaving it as optional.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results