If you updated your iPhone 3GS to iOS 5.0, 5.0.1, 5.1, etc; and you noticed that you lost service and could no longer connect to a cellular network, you’re in luck. You probably remember being unlocked and the problem is you updated your baseband to the iPad baseband (06.15.00) and iTunes corrupted it so that your phone can no longer pick up signal. It is very easy to fix, just follow the step by step guide below to get your iphone up and running in no time.
Redsn0w 0.9.9b4 – Windows
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