First of all you need to check the week of production of your iPhone
you can find this on the back of your iPhone in the SERIAL Number
You will have something like this : 7V745xxxxxx
the 45 means it was produced on the 45th week
iPhones from week 45 and above have the new Bootloader version 4.6 with the 1.1.2 Firmware which is unlockable without a TurboSim
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