Learn how to use your Samsung Galaxy S4; if you forgot the SIM PIN Password. If you enter the wrong SIM PIN more than 3 times, you will need to contact your Service Provider Representative to get the PUK code for your device.
Each time you enter a wrong SIM PIN number the phone will display how many attempts you have remaining.
After the third incorrect attempt, the Type PUK and new PIN code screen displays and your SIM card is locked.
Enter the new PUK code that you received from your Service Provider Representative in the PUK code field.
Enter a new PIN code in the New PIN code field and tap OK.
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.