How To Unlock SIM Carrier on Galaxy S4 [Free]
So the network, you are using on your Galaxy S4, is irritating you and want to get rid it off now? Well! It’s easy, there are various reasons to SIM unlock Galaxy S4 like if you are abroad, there you need to use another network’s SIM but phone is locked, sometime the SIM carrier gives you freedom against a small free but everyone is might not be lucky. Even there are many online services that enable you to buy the IMEI unlock code, but everyone doesn’t trust.
The Korean company seems to be a bit relaxed toward letting you to get a SIM unlock and here we will walk you through how to unlock SIM carrier Galaxy S4.
DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.
Step #1: Launch the dialer app on your Galaxy S4.
Step #2: Dial #0011# using dialer.
Step #3: Press the menu button followed by the back key.
Step #4: Tap on menu button again.
Step #5: Select KEY INPUT.
Step #6: Enter 1 and confirm the action be selecting OK, it’ll take you to service mode.
Step #7: Press the menu button again and tap back. It’ll get the Main Menu for service mode, then tap 1 UMTS.
Step #8: Here select DEBUG SCREEN followed by  PHONE CONTROL.
Step #9: Once you’re on next screen, select  NETWORK LOCK.
Step #10: When you see three options, select  PERSO SHA256 OFF from them.
Step #11: Return to main menu by tapping on Menu button followed by back key.
Step #12: There select COMMON and then select  NV REBUILD.
Step #13: You’ll know that you have a “Golden backup”, then select Restore Back-up.
Step #14: It’ll take you to series of “conditions”, there it will freeze first, then it’ll take you to black screen with BLUE LED on buttons and then it’ll reboot phone automatically.
Step #15: That’s it, you are done, the procedure may take a few minutes, so be patient until phone boots.
Great job, now you can use any SIM card as your phone is network unlocked. If you encounter any error, leave a comment, be sure to check the tips and tricks section.
Via: Redmond Pie