Thank you so much. Last week, I had serious yahoo mail issues. I'd forgotten that I'd deleted yahoo mail and added it again. Thus turning off notes in the mail settings (notes was not enabled on email). Thank you for posting this. Your comments saved me from buying expensive recovery software that I could only see using this one time. You also saved me from a long system retore on my iphone which may have caused me to lose unsaved data. This is the easiet way to get your deleted notes compared to the alternatives.
Deleted, lost notes on iphone 5
On your iPhone:
1) Settings
2) Mail, Contacts, Calendars
3) Gmail>turn Notes On
4) Then to All of my other email accounts and checked the notes were on. I.e, iCloud, Yahoo, etc.
Thank you Pachimolina.