not sure about this but I think your just supposed to enter the code into your phone from the call screen and hit the green key???
I'll see if I can find some more info for you man!
this should work...
You must have a SIM card in your phone to complete these steps (can be active or inactive ). Make sure the phone is not displaying the low battery warning!
Go to settings
Go to advanced options
Go to sim card
Type MEP[Alt + 2]
It will ask you for the unlock code.