Nokia 5100 - Manual (Page 51)

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CHANGE YOUR PIN2 CODE
1 Press Menu 4-7-6-3 (Settings > Security settings > Access codes >
Change PIN2 code). You’re prompted to enter the current PIN2 code.
2 Enter the current PIN2 code and press OK. You’re prompted to enter
the new PIN2 code.
3 Enter the new PIN2 code and press OK. You’re asked to verify the new
PIN2 code by entering it again.
4 Enter the new PIN2 code again and press OK. A message appears in
the display confirming you’ve changed the PIN2 code.
Personal unblocking key (PUK) codes
PUK and PUK2 codes are used to restore blocked PIN and PIN2 codes.
Both PUK and PUK2 codes are eight characters in length and cannot
be changed. PUK and PUK2 codes must be obtained from your
wireless provider.
Important: If you enter an incorrect PUK or PUK2 code 10 times
in succession, the message SIM rejected appears in the display
and the SIM card can no longer be used. You must contact your
wireless provider for a new SIM card.
Closed user groups
A closed user group is a network service that specifies the group of people
whom you can call and who can call you. For more information contact
your network operator or service provider.