After samsung blocked the hidden service menu unlock for s4 i am bit worried .but today i found out new process to unlock for free in a website

Step 1: Launch the Phone app on your Galaxy S4, and dial in: *#0011#

Step 2: Press the Menu button followed by the Back key. Then, hit the Menu button again and select KEY INPUT. Enter 1 and press the OK button to enter ServiceMode.



Step 3: Press Menu one more time and tap back again. This will pull up the Main Menu for ServiceMode. Tap UMTS.



Step 4: Now select DEBUG SCREEN, followed by PHONE CONTROL.



Step 5: From the next screen, pick NETWORK LOCK.



Step 6: You’ll get three options. Hit the one that says PERSO SHA256 OFF.



Step 7: Now, you need to get back to Main Menu. To do this, hit the Menu button followed by the Back key. In Main Menu, now pick COMMON, and then NV REBUILD.



Step 8: The phone will tell you that a Golden Backup exists. Tap Restore Back-up.