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Stop right there!

Uh-oh. Here we were, thinking jailbreaking iPhones that had been upgraded to iOS 4.2.1 was going to be easy. After all, the jailbreak application was ready before the upgrade was even released!

But it turns out Apple, clever sods that they are, have taken the upper hand in the jailbreak wars. iOS 4.2.1 includes a new feature which checks the 'baseband firmware' - the part of the iPhone's software which manages the actual connection to the mobile network - against a special signature in the iOS software. What that means is that if you've tampered with the baseband - by, say, unlocking your jailbroken phone to work with another network - your phone won't boot.

So far as we can tell, this isn't making jailbreaking iOS 4.2.1 phones impossible, only unlocking them to work on another network. Still, if you want to retain the freedom to do that in future, you'd better stick with iOS 4.1. Of course, if you have no idea what we're talking about, then don't worry your pretty little head about it, just enjoy whatever apps you can get from the App Store.

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