The Dev team has just made available to us its updateultrasn0w (0.9). This new version would seem, from the first feedback, much more stable than the unlocking tool designed by Geohot (Purplesn0w).
As a reminder, Ultrasn0w 0.9 Unlock iPhone 3G / 3Gs from abroad. This method is obviously not without risk, so here you are warned!
In the press release manent of the Dev Team, we can note this tip of irony destination of Geohot or a little war seems well underway!
If you want dsimlocker your iPhone using this tool, your precious must be beforehand jailbreak. Once done, then install Ultrasn0w 0.9 via the Dev Team source (repository) via the address http://repo666.ultrasn0w.com. Once Ultrasn0w 0.9 install, all you have to do is launch it!
We discuss it on the forum.