Samsung SGH-I527ZKBATT - Manual (Page 135)

Set up SIM card lock
Prevent another user from using your SIM card to make
unauthorized calls or from accessing information stored on
your SIM card by protecting the information using a PIN code.
When enabled, your phone will ask for a PIN number each
time you use the phone. Using this option you can also
change your SIM PIN number.
➔ Settings ➔
More ➔ Security.
1. From the Home screen, tap
General General
2. Tap Set up SIM card lock.
3. Tap Lock SIM card, enter your SIM PIN code, then tap
OK.
Note: You must activate Lock SIM card before you can change
your SIM PIN code.
4. Tap Change SIM PIN.
5. Enter your old SIM PIN code and tap OK.
6. Enter your new SIM PIN code and tap OK.
7. Re-type your new SIM PIN code and tap OK.
Forgotten SIM PIN password
If you enter the wrong SIM PIN more than 3 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, 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 and
tap OK.
5. Enter the new PIN code again in the Confirm your new
PIN field and tap OK.
Note: While your SIM PIN is locked, you will still be able to
make Emergency calls if necessary.
Changing Your Settings 128