Shortly after GeoHot released his PurpleRa1n jailbreak, the Dev Team posted a video showing a jailbroken iPhone 3GS running the UltraSn0w unlock.

Our ultrasn0w program uses the at+xlog crash as an injection vector of our unlocking payload — and it does so on the 3GS in exactly the same way as on the 3G! But this injection vector will be lost if you update to 3.1 using the official Apple IPSW, which updates the baseband. So stay away from official 3.1 IPSWs until we release the tools that let you update the firmware without updating the baseband.

The Dev Team is still waiting on the OS 3.1 update to release its jailbreak.

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