Samsung SM-G870ARREATT - Manual (Page 126)

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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 the next time you try and enter the SIM PIN
number.
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 on the keypad
that is displayed.
4. Enter a new PIN code on the keypad that is displayed
and tap OK.
5. Enter the new PIN code again in the Confirm PIN code
field and tap OK.
Note: While your SIM PIN is locked, you will still be able to
make Emergency calls if necessary.
Make passwords visible
When enabled, password characters display briefly as you
touch them while entering passwords.
1. From the main Settings screen, tap Security.
2. Tap Make passwords visible to create a checkmark and
enable or disable the display of password characters.