How can I jailbreak my iPhone 3G iOS 4.2.1?
First of all, if you have an unlocked iPhone don't update your device to the official iOS 4.2.1 or use the redsn0w 0.9.6b4 jailbreak. You will lose your unlock. Always back up your SHSH files before jailbreaking. This will preserve your ability to downgrade in the future. You must also find out if a tethered jailbreak is necessary on your device. To see if you can jailbreak untethered find out if your iPhone is an MC model. All iPhone 4 models currently require a tethered jailbreak.
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