Great day today for unlockers, firstly the free unlock via SAM (Link) and then Applenberry finally anouncing the new Gevey Sim ultra, which would unlock 04.11.08 and 04.12.01 iPhone baseband for good! Before buying Gevey Sim though, make sure you first try to unlock your device using SAM first(Link given above). If this method fails, then you can pre-order the new Gevey Sim ultra from Applenberry website.
The wait is over! The new GEVEY™ Ultra can now unlock your iPhone 4 running iOS 5.1 or earlier with modem firmware up to 4.12.01. Available now for pre-order and expected to ship April 27. Reserve your GEVEY™ Ultra now before our first shipment sold out.
You can now unlock your GSM iPhone 4 with the new GEVEY™ Ultra turbo Sim. will work for iOS version 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 5.1 with modem firmware 1.59, 2.10, 3.10.1, 4.10.1, 4.11.08, 4.12.01. Be sure to check your firmware version before purchase!
You can pre-order the new gevey sim ultra here: http://www.applenberry.com/gevey-ultra-gsm/