Samsung SM-C105AZWAATT - Manual (Page 148)

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Note: You must activate Lock SIM card before you can change
your SIM PIN code.
3. Touch Change SIM PIN.
4. Enter your old SIM PIN code and touch OK.
5. Enter your new SIM PIN code and touch OK.
6. Re-type your new SIM PIN code and touch OK.
Forgotten SIM PIN Password
If you enter the wrong SIM PIN more than three times, you
will need to contact your AT&T Customer Service
Representative to get the PUK code for your device.
1. Each time you enter a wrong SIM PIN number the
phone will display how many attempts you have
remaining.
2. After the third incorrect attempt, the SIM is now
disabled, Enter PUK code to continue. Contact
carrier for details displays and your SIM card is
locked.
3. Enter the new PUK code that you received from your
AT&T Customer Service Representative in the PUK
code field.
4. Enter a new PIN code in the Enter a new PIN field.
5. Enter the new PIN code again in the Confirm your new
PIN field.
Note: While your SIM PIN is locked, you will still be able to
make Emergency calls if necessary.