Zilva,
PUK and PIN are two security features provided by the service provider. The defaults are 00000000 (eight zeros) and 12345 respectively. BUT, given wrong three or more times locks the SIM and it has to be replaced for a small charge to retain the old number. Hence, you must call up the helpline of the service provider and ask for a SIM or the procedure to undo the damage. And in future I would suggest not to use these codes anywhere as we all tend to forget them sooner or later.
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