There is a new iPhone unlocker developed by a iPhone Development Team in Russia.
Its called the Pwnage Tool and it can be downloaded from http://www.iphone-dev.org. Currently only available for the Mac OSX version. It allows users to modify their iPhone's bootloader to allow it to boot any software. In its native state, the iPhone bootloader is what prevents it from booting unauthorized (non Apple) firmware.
Watch the tutorial on how to install and unlock your iPhone with it.
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