I recently updated my iPhone 3GS to iOS 5.0.1, and the baseband got updated to 06.15.00. I jailbroke it using redsn0w 0.9.10b1.
Now no matter what I try, I'm not able to unlock my iPhone. I tried installing Ultrasn0w, but that's not working.
I suspect that this is happening since I didnt preserve the baseband.
I'd be very very thankful if anyone can tell me how to proceed right now. I'm stuck and I'm really in need of help. Please.