Nokia RM-926 User Manual page 59

PUK or PUK2
Security code (lock code, password)
59
These are required to unblock a PIN or
PIN2 code.
If not supplied with your SIM card, contact
your network service provider.
This helps you protect your phone against
unauthorised use.
You can set your phone to ask for the lock
code that you define.
Keep the code secret and in a safe place,
separate from your phone.