Nokia 7210 - Manual (Page 52)

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Manage phone security
A message appears in the display confirming your PIN code has
been changed.
The PIN2 Code
The PIN2 code is required for features such as Fixed dialing. If you enter
an incorrect PIN2 code three times in succession, the PIN2 code is blocked
and you’ll have to enter the PUK2 code.
Note: The original PIN2 code must be obtained from your
wireless provider.
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.