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Sometimes this is a sim problem and sometimes this is a phone internal problem. First,change your sim card and enter another sim card.If it works then it's fine otherwise you'll have to give your mobile for repairing
IF you put PUK code many times depending on the model it wil lock the sim card. This is because to prevent unathorised person using your SIM card.
Default PIN code for nokia mobile is 0000
PUK code will be given by the service provider only.
Please call your service provider or go to service provider office,they will assist you in this issue.And they will have a security check like name,Phone number and other information to check weather the SIM card belongs to you only.Then they will assit you.