Blackra1n RC3: What are the Benefits of Unlocking and Jailbreaking iPhone 3G and 3GS
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How to Unlock and Jailbreak Your iPhone 3G/3GS with Blackra1n RC3
If you have an iPhone 3G or 3GS running on iOS 3.1.2 and you want to unlock it for any carrier and jailbreak it for access to Cydia and other tweaks, you can use Blackra1n RC3, a simple and fast tool developed by George Hotz (aka geohot).
Blackra1n RC3 can jailbreak all iPhone models (2G/3G/3GS) and iPod touch models (1G/2G/3G) on iOS 3.1.2. It also includes blacksn0w, which can unlock iPhone 3G and 3GS with baseband 05.11.07, which was previously not unlockable.