iPhone unlocked and working on O2

I was able to use the steps detailed in the Free iPhone Software Unlock guide to unlock my iPhone this morning. The whole process took about 30 minutes, and I was ready to make phone calls. Since my phone had already been activated with an AT&T SIM before I started this process, I ran into a slight problem the first time I rebooted my phone. After that reboot my iPhone was no longer activated. To fix that I used iASign to re-activate my phone. I ran into one more problem, which was that my iTunes purchased content stopped working on my phone. To fix this I plugged it into a laptop that was enabled on my iTunes account, did a sync and that cleared things up. I'd suggest that if you are going to do this on your own, start with a fresh iPhone (either new or just restored).