A good news just happened here because Dev Team has proudly released Redsn0w 0.8 that support Winterboard and Ultrasn0w. Redsn0w is known for it’s ability such as multi-platform, multi-device jailbreaking, easy to use and also unlocking tool for the iPhone 2G (the original iPhone) and unlocking iPhone 3G also iPod touch (1st and 2nd generation)
Right now Redsn0w 0.8 only support and available for Windows, Linux and Mac OS X. If you have already jailbreaking you can further follow the guide to unlock your iPhone 3GS OS 3.0 using UltraSnow.
After unlocking with Ultrasn0w on 3GS reset your network setting once from Settings->General->Reset->Reset Network settings once.
Download Redsn0w 0.8 to Jailbreak iPhone 3G/3GS 3.0 (Torrent)
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