My husband’s Notes have disappeared

Re: "My husband’s Notes have disappeared : My husband’s iPhone"

Wondering if your husband's iPhone is short on storage space in which to operate smoothly:

How to check the storage on your iPhone and iPad - Apple Support

If there is very little storage space free (Phone needs about 8Gb free in order to operate properly):

How to back up your iPhone, iPad, and iPod touch - Apple Support before deleting / making space.

More Backup methods for iPhone, iPad, and iPod touch - Apple Support

If needed: scroll to "Manage space on your iPhone, iPad, or iPod touch”

If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support

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Apple support's online article may help recover the notes that have disappeared:

What to do: If you're missing notes on your iPhone, iPad, or iPod touch - Apple Support

Else: There may be a back-up containing the notes:

How to: Locate backups of your iPhone, iPad, and iPod touch - Apple Support

How to: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Set up notes from the iPhone, turn on notes box to upload them to iCloud Set up iCloud for Notes on all your devices - Apple Support