I didn't get ios 18 on my phone

To be able to install iOS 18.0, you'll need to uninstall iOS 18.1. This article will tell you how: How to uninstall iOS or iPadOS beta software - Apple Support.

Hello! Thank you for posting in the Apple Support Community. We have a community for English here: discussions.apple.com. Since you’ve posted in English, we’d be happy to see you join us there.

Thanks!