iPhone calendar entries disappeared
All of my calendar entries disappeared after installing iOS 18.3.1
iPhone 14, iOS 18
"iPhone calendar entries disappeared: All of my calendar entries disappeared after installing iOS 18.3.1"
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Getting Lock Calendar Entries Back:
Enable Calendar in iCloud on all of your devices. All would then sync: Set Up iCloud for Calendar On All your Devices - Apple Support
Also...
Updating your iPhone:
Updating your iPhone to the most-recent release (iOS 18.3.2 as of this reply), you'll avoid security bugs and get new features. If that update did not install, then try updating using a computer...
Update Using a Computer:
Use my User Tip: Update your iPhone Using a Computer - User Tip
- Back Up First: IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update