In case of deleted notes on iPhone & how to restore (https://datarecovee.com/how-to-recover-deleted-notes-on-iphone/) them is your question, there are several effective methods to follow. The simplest one is to open the Notes application, and in the list of folders, look where Apple stores the deleted notes first, and only removes them permanently after a while. They could also be restored at iCloud.com as part of the Recently Deleted folder there in case they were synced with iCloud. Finally, you can also recover all the notes through restoring your iPhone with a corresponding iCloud or iTunes backup, which has the notes, although it will overwrite the later contents.