Unlock iPhone 3GS iOS 5.0.1 with baseband 06.15.00 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.
I've used this tutorial before. In fact, I'm using it right now to unlock my boss's iPhone.