#iOS18 will be released soon. If you want to switch back to official releases, turn off Beta software update now.

https://medium.com/@eplt/how-to-upgrade-to-ios-15-from-betas-or-rc-version-3054cb07e561

Reminder, if you have been using iOS 18 beta, it’s time to switch off the Beta update toggle before the GM version. Usually, GM will be the final released version, but even with minor tweaks they might still have the same build number. So turn off the beta update now, and you will get the final official version and skip the GM.