Sometimes the data on iPhone will disappear with known reasons.
There is something important you need to know.

You should stop using iPhone. Because the lost data might be overwritten by new data.
If you have backed up data with iTunes or iCloud, you can recover iPhone notes from iCloud or iTunes backup files.

Therefore, what can you do if you don't have a backup file?

You can choose FoneLab iPhone data recovery to recover deleted note iPhone.
It is easy to use, just connect, scan and recover.

It is no doubt that you can also use FoneLab to recover safari history, photos and more.