I have an iPhone 4S and asked my carrier to unlock my phone. They agreed, saying all I had to do was connect my iPhone to iTunes, restore to factory settings, then restore my backup onto the phone. I had iOS 5.1.1, and with the restore had to update to iOS 6.0.1. Upon doing this, I launched WhatsApp and it works fine except that my chat history is gone. Is there any way to recover it without restoring from the iOS 5 backup? Thanks!