If you have already backed up your iPhone with iTunes, you can get the deleted data back by the following steps using iTunes:
Click the File menu and select Devices > Restore from Back up.
Open the iOS device's Summary tab. There are two ways to access this:
Click the device button in the upper right corner. (If viewing the iTunes Store, click the Library button in the upper right corner. The device button will then be visible.)
From any view in iTunes, click the View menu and select Show Sidebar. Select your iOS device in iTunes under Devices.
Click the Restore Backup button.
If haven't had time to back up your iPhone before the deletion, you can restore iphone with MobiKin Doctor for iOS