Very anxious to unlock your Galaxy S4? Well, we will help you to carrier unlock your GS4 device for free.
If you have purchased your Galaxy S4, on contract basis, from AT&T, Verizon or any other provider, you probably would have waited to completely Sim Unlock your device, that is something annoying on the other side, when you can use any other network, SIM Card on your Galaxy S4. For your Samsung Galaxy S4 GT-I9505 to work on any Sim Card, first you have to complete your contract and then your provider can then Sim Unlock your Galaxy S4 GT-I9505.
I know most of you cannot wait and want to Sim Unlock your devices! Therefore, I have come up with a guide or you can tutorial, to show you, how you can Sim Unlock Galaxy S4 GT-I9505 for free. Down below, I have given step by step, instructions with real images, to exactly show you, how to Sim Unlock your device.
How-to: Free Sim Unlock Galaxy S4 GT-I9505
Note: This Method Only works, with Galaxy S4 GT-I9505 Model, It won’t work with other variants or models of GS4.
Step 1. Open up your dialer and dial this code on your Galaxy S4 GT-I9505 *#0011#.
Step 2. Now you need to enter into service mode on your GS4, Just hit the Menu button, then hit the Back button. Now again, hit the Menu button and choose KEY INPUT, at last enter 1 and you will be in service mode.
Step 3. Now you need to press the Menu button one more time, and then tap back, which will take you into Main Menu. From the Service Mode, main menu, choose or tap, UMTS .
Step 4. After step 3, you will be taken to another menu, here you need to tap the option 1, called, DEBUG SCREEN.
Step 6. Now next appeared menu, choose option  NETWORK LOCK.
Step 7. It will give you 3 options, and you need to choose,  PERSO SHA256 OFF.
Step 8. Now hit the Menu button followed by Back button, to go back to main menu. From the main menu, select  COMMON, and then  NV REBUILD.
Step 9. Now you need to tap the  Restore Back-up.
Now you’re almost done, Sim Unlocking your Galaxy S4 GT-I9505, after step 9, your device will go through unusual steps like freezing, Black screen and at last it will reboot automatically, remember it can take upto minutes depending on your device. Eventually when your Galaxy S4 reboots normally, you will be able to use any Sim Card you want to.
Hoping this Sim Unlock Tutorial, has helped you in unlocking your Galaxy S4 device get-i9505, still if you do have queries or confused at any step let us know in the comment section.
At last thanks to the Caesar for his nice, working hack tip.[via: redmondpie]