Before ask any code check the simlock counter. If locked the code is useless.
to enter engineering menu *#*#7378423#*#*
look around somewhere in you w'll find the simlock it's look like this (if you confused take a pic and attech)
this is a classic simlock locked menu, unlockable
[x] Network 5
[] Network subset 0
[] Service provider 0
[] Corporate 0
[] SIM 0
non classic still unlockable
[o] Network 5
[] Network subset 0
[] Service provider 0
[] Corporate 0
[] SIM 0
non classic probably japanese or carrier hard locked (impossible to unlock)
[x] Network Unlimited/255
[] Network subset 0
[] Service provider 0
[] Corporate 0
[] SIM 0
All counter gone (impossible to unlock)
[x] Network 0
[] Network subset 0
[] Service provider 0
[] Corporate 0
[] SIM 0
If the counter is 0 you can unlock your phone but only via cable
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