I have iPhone 4, it was running iOS 6.0.1, and has just upgraded it to iOS 6.1 few hours ago. But now I have a problem after upgrading my iPhone 4 to iOS 6.1, it give me no service on the signal bar, ultrasn0w is not working now on my iPhone 4 with baseband 4.12.05, so how can I unlock it to use it on any carrier?
>>> How to Unlock 6.1 iPhone 4 on 04.12.05 Baseband?