Access codes
Select 
> Settings .
To define how your device uses the access codes and security settings, select General > Security > Phone and SIM card and from the following:
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The PIN (UPIN) code, supplied with the SIM (USIM) card, helps to protect the card against unauthorised use.
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The PIN2 (UPIN2) code, supplied with some SIM (USIM) cards, is required to access certain services.
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PUK (UPUK) and PUK2 (UPUK2) codes may be supplied with the SIM (USIM) card. If you enter the PIN code incorrectly three times in succession, you are asked for the PUK code. If the codes are not supplied, contact your service provider.
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The security code helps to protect your phone against unauthorised use. You can create and change the code, and set the phone to request the code. Keep the code secret and in a safe place separate from your phone. If you forget the code and your phone is locked, your phone will require service. Additional charges may apply, and all the personal data in your device may be deleted. For more information, contact a Nokia Care point or your device dealer.
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The barring password is required when using the call barring service to restrict calls to and from your phone (network service).