Completed iOS 13

Hi LadyDi58,

Welcome to Apple Support Communities. I understand that after updating to iOS 13, you're missing notes in the Notes app on your iPhone. I know how important the notes you keep on your iPhone can be; I'd like to help. The options to potentially recover your notes depends on how they were being stored on your device; check Settings > Notes to see what is listed as your default account, and proceed with the applicable steps below:

• If you were using iCloud to store your notes:
  • Log in to iCloud.com using a web browser on a Mac or PC; if you see your Notes in iCloud, on your iPhone tap Settings > Your Name > iCloud and tap to disable Notes, wait a moment, then re-enable and check for your data in the Notes app

• If you were using a third party email address to sync notes with your iPhone:
  • Tap Settings > Passwords & Accounts > Email account; if Notes is enabled, tap to disable and wait a moment before enabling again, then check for your data in the Notes app.

• If you were using the "On My iPhone" account it's possible your notes are stored with an iCloud or iTunes backup. Use the resources below to locate and restore a recent backup if needed. Please note that restoring a backup will overwrite the information on your device with that of the backup and it is not possible to merge or pick and choose information from backups:
  • Locate backups of your iPhone, iPad, and iPod touch
  • Restore your iPhone, iPad, or iPod touch from a backup

Best Regards.

After IOS 13 installation, many of my Notes say “no additional text” what happened to all my data? I didn’t have iCloud for Notes turned on. Looking for Any way to recover?

I'm the same. Hopefully someone from Apple will respond soon