If you own iphone 4 with IOS 4.2.1, you might like to jailbreak iphone 3gs 4.2.1 . In this post I will post some links regarding how to jailbreak iphone 4 and how to untethered jailbreak 4.2.1. Some of the links that I will post might include tutorial on how to jailbreak iphone 3gs 4.2.1 using redsn0w or how to jailbreak iphone 4 3gs 4.2.1 with PwnageTool 4.1.3.  This post is dedicated to iphone users that want to do ios 4.2.1 jailbreak. Later on ,  I will also post about the jailbreak iphone 4 videos

Enjoy the links :

http://www.gadgetsdna.com/jailbreak-ios-421-using-redsn0w-tool-guide/7339/

http://www.theiloop.com/how-to-jailbreak-and-unlock-iphone-3gs-and-iphone-3g-using-redsn0w-windows/

http://www.techpetals.com/how-to-jailbreak-iphone-3gs-4.2.1-with-pwnagetool-4.1.3-2599

And this the jailbreak ios 4.2.1 video tutorial :

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