Ultrasn0w 1.2.1 carrier unlock now available for jailbroken iPhones running iOS 4.3.1

Anyone who relies on a carrier unlock to use their iPhone on another GSM carrier, can now take the iOS 4.3.1 plunge thanks to ultrasn0w 1.2.1. The iPhone Dev-Team have worked their magic to make ultrasn0w functional once again for the iPhone 4 (GSM), 3GS and 3G, and to correct a signal bar issue for anyone maintaining an older baseband but not using an unlock.

It's important to note that this isn't a new carrier unlock, and still requires an older baseband. Therefore if you're intending to upgrade to iOS 4.3.1 make sure you use something like Pwnage Tool to maintain your existing baseband, and do not just upgrade using iTunes in the hope of using redsn0w to jailbreak, as that will result in ultrasn0w being locked out.

Once you've jailbroken your iPhone using Pwnage Tool, fire up Cydia and search for ultrasn0w to get your carrier unlock installed, then just reboot your phone. Voila! Carrier unlocked.

Ultrasn0w 1.2.1 carrier unlock now available for jailbroken iPhones running iOS 4.3.1 originally appeared on Download Squad on Mon, 11 Apr 2011 05:00:00 EST. Please see our terms for use of feeds.

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