pwnagetool
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Those iPhone users who have bought iPhone 3G, 3GS & 4 from official carrier then jailbreak & unlock it to use with carrier of their own choice often ...
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Redsn0w 0.9.6B4 can jailbreak iOS 4.2.1 on iPhone 4 but for that you need to update your iPhone 4 to iOS 4.2.1 which will upgrade its baseband leaving you in ...