Nokia 6720 classic - Device and SIM card security

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number programmed into your device.
To change the lock code, select Phone and SIM card > Lock

code. The default lock code is 12345. Enter the current code

and then the new code twice. The new code must be 4-255

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Settings

characters long. Alphanumeric (uppercase and lowercase)

characters can be used. The device notifies you if the lock

code is not properly formatted.