Recovering iPhone text messages
Restoring a deleted text message to your iPhone is possible provided you’ve previously “synced” the iPhone with iTunes, as it’s this process that creates an emergency backup of most personal data - texts, pictures, apps and so on - stored on the phone.
But it’s worth noting that reverting to the emergency backup will mean you lose things added to the phone since the last back-up.
However, new apps can be restored by downloading them for a second time - you shouldn’t be charged for a second download - and new pictures saved by dragging them onto your PC’s desktop from the iPhone’s memory.
To restore deleted text messages from your previous iPhone backup, simply:
Connect the smartphone, via the white cable, with your PC and open iTunes
Cancel the back-up that automatically starts up when you sync the phone with your PC
Click on Settings, then General, Reset, Erase All Content
When prompted, restore your iPhone to the previous back-up.