Hi Eddy. Welcome to justanswer.
The PIN code is not of the phone but of the SIM and it depends on the operator's choice. It can be 0000 or 1234 or ... something else.You should call the network operator and ask.Failing to enter the PIN code 3 times will lock the SIM and you will have to call the operator and ask for the PUK code.12345 is Nokia's default security code and that is about locking device features and not about accessing the SIM card.
Do you have any other query?
Which network provider's service are you using?
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