I lost my iPhone and how to retrieve the iPhone data if possible?

My iphone was stolen, the information of contacts and SMS are important to me, i heard that they can be recovered from the iPhone backup files, but how to do?

Yep, the http://www.potatoshare.com/itunes-data-recovery.html can be a good solution for you.
It can extract most data from iphone backup files including photos, contacts, text messages, call history, calendars, notes and so on. You only need two steps to recover data:

Step 1: When be launched, the app will automatically show all the backup files in a list, choose your iphone by the device name and click "StartScan"

Step 2: After a fast scanning, all the data will be extracted and showed in well-organized catalogues, select the wanted ones and click "Recover" button.

IPhone Backup Location for Mac OS X
in Mac OS X your iPhone files are backed up at the following location:

~/Library/Application Support/MobileSync/Backup/

The (~) symbol signifies your home directory, which is the same place all your other personal documents are stored.

iPhone Backup Location for Windows 7, XP, and Vista
Windows XP stores all of your iPhone backup files in this location:

C:\Documents and Settings\user\Application Data\Apple Computer\MobileSync\Backup

Windows Vista and Windows 7 backs up the iPhone files to here:

C:\Users\user\AppData\Roaming\Apple Computer\MobileSync\Backup

With "iExplorer", you can save them with free.

If it works, can you give me the best answer.

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