If you are interested in video guides, here’s a good one to untethered jailbreak your iPhone 4, 3GS, iPod touch 4G, 3G or iPad using Redsn0w 0.9.6rc16.
If your iPhone 4, 3GS relies on ultrasn0w unlock you should stay away from redsn0w, you have to restore your iPhone via pre-jailbroken custom firmware, simply you have to Click Here (sn0wbreeze 2.7.1 for Windows) or Click Here (PwnageTool 4.3.3.1 for Mac) to preserve your old baseband to unlock it with ultrasn0w.
Download Redsn0w 0.9.6rc16 for Windows
Download Redsn0w 0.9.6rc16 for Mac
Download iOS 4.3.3 for iPhone, iPod touch, iPad
Download iTunes 10.2.2
