Some iPhone owners recently discovered that their Notes were missing from the handset. Savvy users figured out that accepting the new iCloud terms of service on the iPhone triggers the bug, and the Notes disappear. It happens after the iOS 18 update, but the iPhone doesn't delete the Notes documents.
That data is still safe in iCloud, but the Notes app won't sync with it properly after agreeing to the updated terms of service.
We showed you how to fix the disappearing Notes bug a few days ago.