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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It still amazes me how quickly this group of hackers are able to get into devices and find holes they can exploit.  A jailbreak and unlock solution is confirmed by the iPhone Dev-Team.  The same 24Kpwn exploit used to jailbreak the iPod Touch 2G with Redsn0w can be used for the iPhone 3G S, confirmed by the iPhone Dev-Team late last night.

They have not packaged a jailbreak solution yet, but because of the same basic weaknesses that allow Redsn0w to jailbreak the other Apple devices, it should be no time at all till we see it released.  They explain that they want to make sure that they safely package this before release, which didn’t take them that long for 3.0.

An unlock solution has also been found for the iPhone 3G S, it’s called Ultrasn0w.  Yes, the very same application to unlock the iPhone 3G has been confirmed to work with the iPhone 3G S.  They say that Ultrasn0w is ready right now to unlock the 3G S, without any modifications what-so-ever.

via iPhone Dev-Team

The long awaited Ultrasn0w soft unlock for the iPhone 3G has been released.  In order to unlock your iPhone 3G you first need to update to 3.0 and jailbreak with either Redsn0w or PwnageTool.  You can find instructions for jailbreaking here: How To Jailbreak Your iPhone 3G
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