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How To Jailbreak iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G On iOS 4.2.1 You can follow these step-by-step guide to How to jailbreak your iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G On iOS 4.2.1 using greenpois0n. 1.Go to http://www.greenpois0n.com/ and click on the Windows icon to download the latest version of greenpois0n. 2.Double click the greenpois0n zip file to extract the file and double click greenpois0n to launch the application. 3.Next connect your iPhone to the computer and power it off. 4.Then click on the Prepare to Jailbreak (DFU) button. How To Jailbreak iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G On iOS 4.2.1