Before trying the below manual options, we recommend contacting the network provider. Ask for the solution and their recommendations. If you have completely paid off your device and used their services for up to 3 months, they would suggest you the right way.

Step 1. Update Your Galaxy 3/Note 2 Device

Your device must be running Android Jellybean 4.1.1. or later. To check the software version, go to "Settings", scroll down and tap on "About Device" and find Android version on which your device is running.

To update your device, tap on "System Updates" and "Check for Updates". Your device will update the network. Since you didn't get any connectivity on the new SIM, you can turn the Wi-Fi network on to update your device.

Step 2. Open Dialer

After the dialer is open, enter the code *#197328640# when the dialer is open. This should open the service menu.

Step 3. Select UMTS.

After you enter the code, the phone will automatically open the Service Mode menu. Here, Select [1] UMTS.

Step 4. Open the Debug menu.

In the UTMS menu, tap [1] DEBUG SCREEN. In the Debug menu, tap [8] PHONE CONTROL. And then in the Phone Control menu, tap [6] NETWORK LOCK.

Step 5: Select [3] Perso SHA256 Off.

After you select this option, wait about 30 seconds. Press the Menu button and select Back. Choose [4] NW Lock NV Data INITIALLIZ.

Restart Your Phone: After one minute, restart your device. It won't give you any notification that the phone has been unlocked successfully. So you need to test your phone out by inserting another carrier’s sim. If you don’t get an ‘IMEI Cellphones unlock Pin’ prompt, it means your phone has been successfully unlocked.

Step 1: Check your device’s compatibility with the method.

This method is for T-Mobile and AT&T Galaxy S4s. It is meant for a stock phone. This method won’t work on Customized ROMs. Also, in all probability, this method won’t work for CDMA phones. So for Sprint and Verizon S4’s the below steps may not work.

Step 2: Open Dialer.

After the dialer is open, enter the code *#27663368378# when the dialer is open. This should open the service menu.

Step 3: Select UMTS

After you enter the code, the phone will automatically open the Service Mode menu. Here, Select [1] UMTS.

Step 4: Open the Debug menu

In the UTMS menu, tap [1] DEBUG SCREEN. In the Debug menu, tap [8] PHONE CONTROL. And then in the Phone Control menu, tap [6] NETWORK LOCK.

Step 5: Select [3] Perso SHA256 Off

After you select this option, the following text should be displayed on your screen:

• SHA256_ENABLED_FLAG[1]


• SHA256_OFF > SHA256_ON

Tap the first line (SHA256_ENABLED_FLAG[1]). Now, the menu should display:

• MENU NOT EXIST


• PRESS BACK KEY


• Press the Menu button and select Back.

Step 6: Make sure the changes in the setting were saved

When you go back, the text from Step 5 should now change to:

• SHA256_ENABLED_FLAG[0]


• SHA256_OFF > Not Change

Step 7: Go back to the UMTS menu

After pressing the menu button, select ‘Back’ four times to return to the UMTS Main Menu. Now, select [6] COMMON followed by tapping [6] NV REBUILD. The following text should be displayed:

• Golden-Backup exist


• You can Restore Cal/NV

Step 8: Restore the backup

In the NV REBUILD menu, tap [4] Restore Back-up. The phone should automatically reboot. At this point, the phone should be unlocked. Now you can test your device by inserting a SIM card from another network carrier. If you don’t get an ‘Unlock Pin’ prompt, it means your phone has been successfully unlocked.

Step 1: Make Sure that Phone is Locked

To check if your phone is locked, insert the new SIM card of the new network. Several devices come unlocked out of the box. So, check before proceeding to save your time

Step 2: Update Your Device

Your device must be running Android Jellybean 4.1.1. To get this method to work, update it to Android 4.3 or later. To check the software version, go to "Settings", scroll down and tap on "About Device" and find Android version on which your device is running.

To update your device, tap on "System Updates" and "Check for Updates". Your device will update the network. Since you didn't get any connectivity on the new SIM, you can turn the Wi-Fi network on to update your device.

Step 3: Make Sure it's a GSM Phone

It is impossible to unlock the device running on the CDMA network. Only the GSM network lets you unlock your phone. It is not sure whether this method will work or not but you may want to at least give it a try.

Step 4: Open Dialer

To access the Service menu, you will have to enter the Samsung SIM network unlock Samsung PIN. Enter the code *#197328640#, when the dialer is open:

Select UMTS-By selecting it, you will access the maintenance menu. If you chose the wrong option, you can get back to the menu by pressing the Menu button.

Select DEBUG SCREEN: You will access the Debug menu.

Select PHONE CONTROL: It will open a menu and you can adjust settings.

Select NETWORK LOCK: You can reach the controls of the SIM Lock function.

Select PERSO SHA256 OFF: Wait for 30 seconds after selecting this option. Get back to the NETWORK LOCK menu by pressing the Menu button

Select NW LOCK NV DATA INITIALLIZ: Wait for one minute after taping on it.

Restart Your Phone: After one minute, restart your device. It won't give you any notification that the process has been done successfully. If you find that your phone doesn’t prompt you for an unlock pin after you have inserted a new SIM card, it means the unlock process worked.

Published by Kopertis Wilayah X

Jalan Khatib Sulaiman Padang
Sumatera Barat
Phone: +62751705637
Fax: +62751705637
Email: bibiet@kopertis10.or.id