The new Ultra allows GEVEY Sim (finally!) the Unlock your iPhone 4 iOS 5.1 as well as previous versions: iOS 4.1 / 4.2 / 4.2.1 / 4.3 / 4.3.1 / 4.3.2 / 4.3.3 / 4.3. 4 / 4.3.5 / 5.0 / 5.0.1 and supports basebands 01.59 / 02.10 / 03.10.1 / 04.10.1 / 04.11.08 and 12.04.01.
To unlock the iPhone baseband 04.11.08 & 04.12.01 4 you will need to have performed a jailbreak iPhone 4 and have installed the latest version of Furious Mod installed via Cydia.
This new Ultra GEVEY Sim for iPhone 4 iOS 5.0.1 and iOS 5.1 is currently priced at $ 49.99 on the site Applenberry.com. unlock iPhone 5 via imei code free
Two other methods Unlock (much cheaper) exist:
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