What is the limitation of the trial version?

The trial version and registered version are the same product. The only functional difference between the trial version and the registered version is that the trial version can only scan iTunes backup files and iOS devices to preview the lost data. You need the registered version to recover and save the scanned data to your computer.

After purchasing, you will get a registration code. Once you register the product, you can immediately recover the previewed data.

iSkysoft Free iPhone Data Recovery allows you to free recover more than 10 file types directly from iOS device or from iTunes backup file.

Free recovery media contents: 2 camera roll photos or videos, 10 photo stream/photo library photos and 10 voice memos.
Free recover text files: 5 contacts or call logs, 10 notes/calendars/reminders/Safari bookmarks.

Note: Currently you need to get the full version to recover SMS and message attachments from iPhone.