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Your nokia 6020 doesn't have problem. It's your sim card. If you still have your simcard packaging, the PUK code is written their inside it's brochure. Or you can also go to your mobile phone network and ask its PUK code. Or simply buy a new simcard with the same network company. Thank you
Open the menu then go to setting. Then scroll down go to restore factory setting and open it then enter the security code 12345 if you dont have change its security code. But if you change it the type your own code. Thank you.