How to unlock iPhone 4 iOS 5.1.1 BB 4.12.01 Softbank Japan?

I got an iPhone 4 locked to Softbank japan baseband 04.12.01. If you know any way to unlock / jailbreak lease help me out.

No look http://www.unlockboot.com/2012/08/safe-and-geniune-factory-unlock-iphone-5-1-1.html?m=1 http://www.besttechinfo.com/how-to-unlock-jailbroken-iphone-4s-4-3gs-ios-5-1-5-0-1-sam/

Sorry I don't know. But I really want to give you an advice that whenever you will unlock your phone must install and use transcribeme application. Its really interesting.

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