Unlocking your Samsung Galaxy S4 so you can use with another SIM Card of GSM Network is very common these days, Many of the possible reason to unlock your device, like you love your phone but not the network service provider due to the excessive charges, poor service or unreliable connection etc.
If you bought a Samsung GS4 with AT&T or T-Mobile etc, Your device is locked to that particular carrier and you are not able to use it with different SIM card. Once the contract period is ended with your network service provider you may request to unlock your device with them, but it is not easy as you think as in the US unlocking becomes illegal after 26th Jan 2013, well there is a new bill is in progress to make it legal.
To switch between different network providers you need to first unlock your device, and if you didn't want to wait for a long and desperate to use another Sim Card, you could do this by paying few bucks to online websites or to a local store.
Here is the step by by step tutorial which shows how to quickly unlock your Samsung Galaxy S4 any model for free.
Before start unlocking, make sure you have properly backed up your device. It's risky if you don't use the instructions properly or not followed the step by step instructions. so it's not our responsibility if something goes wrong by messing around Sim Carrier stuffs.
Step 1: Check and Update Your Phone Version
Your phone must be running on Android 4.1.1 or later to successfully use this method. Check your Android version by navigating to Settings >> About Device and scroll down. also sometimes may be you need to downgrade your firmware version.
Step 2: Dial the Secret Code
Open the dial pad and enter the secret code *#27663368378#. Do not press the call it will automatically opens the Service Mode Menu
Step 3: Select Debug Screen
You would now be at UMTS MAIN MENU under Service Mode, Now select the [1] Debug Screen
Step 4: Select Phone Control
When the DEBUG SCREEN opens you will see the six options, select [6] PHONE CONTROL
Step 5: Select Network Lock
When the PHONE CONTROL screen opens, you will see six options, select [6] NETWORK LOCK
Step 6: Select Perso Sha256 Off
On the next screen you will see three options, select [3] PERSO SHA256 OFF
Step 7: Go back to Main Menu and select Common
Now Go back to Main Menu by tapping the Menu button and select Back option from Menu. Now again you are on the UMTS MAIN MENU, select [6] COMMON
Step 8: Select NV Rebuild
On selecting the COMMON a next page opens, then select [6] NV REBUILD
Step 9: Restore Back up and Reboot
On the next screen of NV REBUILD you will see a notification that a Golden-Backup exist. now select [4] Restore Back-up
Your device will automatically reboot after few minutes, once it is on your phone will be network unlocked and now you can use any SIM Card which is compatible with your phone model.
If you bought a Samsung GS4 with AT&T or T-Mobile etc, Your device is locked to that particular carrier and you are not able to use it with different SIM card. Once the contract period is ended with your network service provider you may request to unlock your device with them, but it is not easy as you think as in the US unlocking becomes illegal after 26th Jan 2013, well there is a new bill is in progress to make it legal.
To switch between different network providers you need to first unlock your device, and if you didn't want to wait for a long and desperate to use another Sim Card, you could do this by paying few bucks to online websites or to a local store.
How to Carrier Unlock Your Samsung Galaxy S4 Easily
Here is the step by by step tutorial which shows how to quickly unlock your Samsung Galaxy S4 any model for free.
Warning
Before start unlocking, make sure you have properly backed up your device. It's risky if you don't use the instructions properly or not followed the step by step instructions. so it's not our responsibility if something goes wrong by messing around Sim Carrier stuffs.
Step 1: Check and Update Your Phone Version
Your phone must be running on Android 4.1.1 or later to successfully use this method. Check your Android version by navigating to Settings >> About Device and scroll down. also sometimes may be you need to downgrade your firmware version.
Step 2: Dial the Secret Code
Open the dial pad and enter the secret code *#27663368378#. Do not press the call it will automatically opens the Service Mode Menu
Step 3: Select Debug Screen
You would now be at UMTS MAIN MENU under Service Mode, Now select the [1] Debug Screen
Step 4: Select Phone Control
When the DEBUG SCREEN opens you will see the six options, select [6] PHONE CONTROL
Step 5: Select Network Lock
When the PHONE CONTROL screen opens, you will see six options, select [6] NETWORK LOCK
Step 6: Select Perso Sha256 Off
On the next screen you will see three options, select [3] PERSO SHA256 OFF
Step 7: Go back to Main Menu and select Common
Now Go back to Main Menu by tapping the Menu button and select Back option from Menu. Now again you are on the UMTS MAIN MENU, select [6] COMMON
Step 8: Select NV Rebuild
On selecting the COMMON a next page opens, then select [6] NV REBUILD
Step 9: Restore Back up and Reboot
On the next screen of NV REBUILD you will see a notification that a Golden-Backup exist. now select [4] Restore Back-up
Your device will automatically reboot after few minutes, once it is on your phone will be network unlocked and now you can use any SIM Card which is compatible with your phone model.