Before read this tutorial, It is necessary to know –
What is unlock code? Why we should know unlock code our phone? How to Place Unlock Code Appropriately To your Samsung Galaxy Mobile. 

I will not guarantee that this code will 100% work. But Just I have tried to give you an Idea of unlock code samsung.

Dear reader, Do not neglect this information on “Unlock code Samsung Galaxy S5” because I have test it several times. Please follow every steps very carefully – Unlock code Samsung galaxy S5 tested method.

1: At first Insert an unsupported SIM card into your Samsung Galaxy S5.
2: Then go to the main window and dial “*#197328640#” from the dial pad on your phone to get Debug menu.
3: After dialing *#197328640#, you will find a UMTS menu on your Samsung Galaxy S5 mobile screen.
4: Now select Debug Screen from UMTS.
5: Next select Phone Control from Debug Screen.
6: And then select Network Lock from Phone Control. Step 7: After then select Option from Network Lock.
8: Now click on PERSO SHA256 OFF from Option.
9: Now wait for a few minutes before going back to the main menu. and wait for the message ‘Network Lock’ then choose NW Lock NV Data INITIALLIZ. (that means you will find a “NV REBUILD” screen and you will see the following text on your mobile screen- “Golden-Backup exist You can Restore Cal/NV”) The phone will tell you that a Golden Backup exists. Tap Restore Back-up.
10: Select Restore Back-up from the “NV REBUILD” screen and wait a moment. Your phone will auto reboot or restart within a few minutes.

See more: How to free Network Unlock Code Samsung Galaxy S5 by unlock code.