Hi. So I finally was able to unlock my 3GS. I had to use the iPad 06.15.xx firmware. The only problem I'm getting is from time to time I lose reception. It would same something like "no cellular data".
I just got my sim card replaced, thinking that was the problem. I have 3G turned off, and roaming is on. My edge and mms works fine. I just lose reception sometimes for probably about 5 seconds, then it comes back to full bars.
This is a known issue with some, not many but some phones. You may want to read the dev team blog about it. They are aware and working on a fix, if there is one................I hope.