It has been confirmed that the Ultrasn0w unlock app for the iPhone 3G does in fact work for the iPhone 3G[s] as well.  You do need to jailbreak first with Geohot’s Purplera1n solution.

Purplera1n does not activate your phone so you will need a legit AT&T sim card in order to jailbreak, but then you can unlock with Ultrasn0w, availble in Cydia, then slip in your T-Mobile sim.
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George Hotz (Geohot) has released his jailbreak solution for the iPhone 3G[s] called Purplera1n. Hotz first made fame for being the first to unlock the OG iPhone. As of right now the jailbreak is for Windows only (XP and Vista, no 7) and you must be running the latest version of iTunes.  Hotz says a Mac version is in the works.
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The iPhone Dev-Team has just stated on their blog that the iPhone 3G[s] jailbreak is ready, BUT they will not release it until Apple releases OS 3.0.1.

They explain a bit how the jailbreak works and why they have decided to make everyone wait for its release.  They do not want to release the jailbreak only to have Apple patch the holes in the firmware.  They believe Apple could easy stop everyone from being able to jailbreak.  This seems like the ongoing cat and mouse game the Dev-Team and Apple play.  I support the Dev-Team 100% because of all the hard work they have provided for free, but this makes me wonder if they are just trying to prevent more work for themselves.  Even if Apple did patch the hole, they would find another one; software is never infallable.

Keep up the good work, we will all have to be patient if that is possible.  Thank you

From the iPhone Dev-Team blog:

Here’s the critical point, the reason why we’re delaying our version of the jailbreak: Once the jailbreak is out, Apple will fix the iBoot-family bug we use to accomplish it.  They will simply stop signing the old iBoots and only sign the fixed ones.  If you bought your phone after Apple has done this, there’s nothing you can do…the jailbreak isn’t going to work for you.

It is possible that Apple will find the bug we use without our handing it to them on a silver platter (via a public jailbreak).  In that case, we will have delayed our jailbreak for “nothing”.  But we’d rather be safe than sorry!

Apple is surely coming out with a 3.0.1 firmware release shortly. They need to fix ultrasn0w.  They need to fix some UI issues.  3.0 is buggy and 3.0.1 is coming.  We’re going to wait and see what 3.0.1 brings before figuring out the release date for our version of the jailbreak.

In the meantime, we have some remaining 3.0 jailbreak issues to investigate, including push notification.  Thanks for being patient with us while we took a 3GS “timeout”!

Geohot and the Dev-Team

Geohot and the iPhone Dev-Team have helped each other with their hacks but the relationship has been rocky.  After Geohot showed that he had successfully jailbroke the iPhone 3G[s] he was asked about releasing it to the Dev-Team; his reply on Twitter, “I don’t expect credit from the dev team. Remember when I gave them the yellowsn0w vector?”

I wonder if this sudden statement by the iPhone Dev-Team will change Geohot’s mind about releasing his own jailbreak tool, or will he take the same path.

George Hotz, aka Geohot, has done it again. Famed for creating the first hardware unlock for the OG iPhone, Geohot has just released the first official pics of a jailbroken iPhone 3G[s]. Geohot has mentioned on Twitter that it is as simple as a 10 line change to the current release of Redsn0w.

Geohot also says that he will be sharing this with the iPhone Dev-Team rather than packaging his own tool for public release. He explains that they have the back-end work already taken care of for a mass public release. This is great because this means that the jailbreak for the iPhone 3G[s] is just around the corner. I’m sure the Dev-Team will want to do testing, but if it is as simple as changing 10 lines of code like Geohot says, it won’t be long.

via Geohot on Twitter and On the iPhone