If you've enabled Find My for that device, you'll want to turn it off before you revert back to iOS 18. Find My is key to the Activation Lock security feature that requires the Apple ID and password of the person who set up the phone. When you finish reinstalling iOS 18, you can turn it on again.

A week after Apple unveiled iOS 26 during the WWDC 2025 keynote, the company started the beta testing of iOS 18.6.

iOS 18.6 Beta 1 addresses a variety of user-reported issues, focusing on improving system reliability and resolving disruptive bugs. These fixes are critical for maintaining a dependable operating system, especially for users who rely on their devices for work or other essential tasks.