Go free your iOS devices! The jailbreak itself is pretty simple, just click jailbreak when your device is plugged in and when it tells you to tap the icon on your device you do it.
Discuss how awesome jailbrea king is! I love the customization you can put into your device.
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I jailbroke a spare 4S I have, so I could unlock it from Vodafone and use it with my sim from my iPhone 4. Turns out that there isn't anything on Cydia that lets you carrier unlock a 4S. God damn it.