You've just had a good (and hard) lesson on why it's important to keep anything important backed up to another device, a cloud account or both. S Notes have changed format from time to time, but even screen shots that you backed up would be of some help to you. Or, as Chris said, use a format that all devices can read - Google Docs, text files, even Word documents or Excel spreadsheets. Then you can read the backed up ones with any phone, tablet, laptop or desktop.