Nokia 3230 - Manual (Page 19)

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Lock code
The lock code (5 digits) can be used to lock the phone and keypad to avoid
unauthorised use.
The factory setting for the lock code is 12345. To avoid unauthorised use of your
phone, change the lock code. Keep the new code secret and in a safe place
separate from your phone.
PUK and PUK2 codes
The PUK (Personal Unblocking Key, 8 digits) code is required to change a blocked
PIN code. The PUK2 code is required to change a blocked PIN2 code. If the codes
are not supplied with the SIM card, contact the operator whose SIM card is in your
phone for the codes.