Managed to jail break and SIM unlock my iPhone 3GS (iOS 5.0.1, FW=06.15.00)

After many hours of effort, I finally managed to get my iPhone 3GS SIM unlocked so that I could use it in Europe with a Lebara SIM. I am not reporting the detailed instructions here because there are so many good descriptions already on the web. I just want to report the overall experience in the hope that it might save someone else the trouble that I had.
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