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Jailbreaking vs. Unlocking Jailbreaking and unlocking the iPhone are two different hacks which allow you to take control of your mobile device in different ways. Jailbreaking is a type of hack that lets you install unapproved third-party applications on your iPhone or iPod Touch from searchable repositories provided by apps like Cydia and Icy. Unlocking, on the other hand, is a hack that lets you use your iPhone on another cellular network. Here in the U.S., that means you can use the iPhone on T-Mobile instead of AT&T. You have to first jailbreak your phone before you can unlock it, but you don't have to unlock a phone in order to jailbreak it. How to Jailbreak the 4.0 Software for the iPhone 3G and iPod Touch Second Generation The "Redsn0w" jailbreak software has been updated to support iOS 4.0 on both Mac and Windows and works for iPhone 3G and the iPod Touch, second generation. This jailbreak is especially helpful for for iPhone 3G owners as the new OS won't offer the much sought-after multitasking feature on their devices. A jailbreak application called multifl0w will, however, provide an alternative. Another jailbreak app called WinterBoard offers a way to customize the iPhone's background even though that too is disabled for 3G owners running the latest OS 4.0 update. This jailbreak guide assumes you've already downloaded and updated your phone or iPod Touch to the latest software, iOS 4.0, and have backed up your device. If you are looking to unlock your phone in order to run it on a network belonging to another carrier, this is not the guide for you.