How to Recover Lost Data/Files from iPhone

First of all, run this iPhone File Recovery on your computer, then you could see in the follow image: all your previews iDevices' backup file will be detected and displayed accordingly. Just choose your iPhone 5/4S/4/3GS device name and hit "Start Scan".

Wait for a little while, the scan will be finished. If the iTunes backup file is very large, then the scan may take more long time. After it, you can see all files on the iTunes have categorized into different folders and list in the left panel, such as call history, contacts, notes, messages, safari, calendar, etc. To recover a specific file, you need to find the folder which the file belong to, and find it in the specific folder as you like.

When all target files have selected, you can click "Recover" button to save them on your computer. To avoid losing again, you can backup these recovered files in any other places as you like.

Solution here: http://www.coolmuster.com/ios-recovery/iphone-data-recovery.html