Almost every iOS update seems to have one bug or another. If you’re someone who relies on your iPhone, you might be tempted to delay the update for a few days so you can see just how buggy this release is, or maybe even wait for the iOS 18.0.1 bug fix release that will inevitably be rolled out soon after.
However, because iOS updates are usually brimming with security updates, I don’t recommend waiting. If you insist on taking this course of action, you do need to make sure that your iPhone isn’t going to automatically update itself during that time.
Also: The best iOS 18 features that will make updating your iPhone worthwhile
To do so, go to Settings > General > Software Update and turn off Automatic Updates until you are ready to update.
If you don’t install iOS 18, then make sure to install the iOS 17.7 update.
Source: Robotics - zdnet.com