If you’ve purchased your Samsung Galaxy S4 from a carrier, then it’s probably locked on that network and you need to SIM unlock it in order to use it on another one. Fortunately for you we have found some easy ways to SIM unlock the Galaxy S4 and you can do it for free.
The reason to SIM unlock your Samsung Galaxy S4 is to be able to use it on another carrier and that’s why SIM locks exist, because carriers don’t want you to leave their network.
If you need to use a SIM from another carrier with your Galaxy S4, then follow the guide below in order to unlock it. We’ll provide you with two methods. One of them is free and only takes a few minutes, while the other one requires you to buy an unlock code, but it can be slightly easier.
You should know that by SIM unlocking your Galaxy S4, it doesn’t mean it will work with any carrier, because it depends on the GSM bands each carrier is using, so you should first check that your smartphone is compatible with it. Make sure to check all bands, including the 2G, 3G, and 4G, because some carriers use different ones and while you might be able to make calls, the data could not work.
Now that we’ve told you what SIM unlocking involves, let’s get to the part where we tell you how to do it. We’ll start with the free method, because it’s our favorite.
How to SIM Unlock the Galaxy S4
This method is totally free, but you have to be careful and follow every step without mistakes, because otherwise you might brick your device. So make sure you don’t do anything wrong and that your phone has enough battery so it won’t turn off during the process.
This should work for all variants of the Samsung Galaxy S4, including I9500, I9505, I9506, I9505G, I337, M919, I545, L720, R970, I959, I9502, I337M, M919V, R970X, and R970C.
- Open the phone dialer
- Dial *#0011#
- Press Menu
- Tap Back
- Press Menu and open the Key input
- Enter 1 and press OK
- Press Menu and tap Back
- Tap UMTS
- Tap DEBUG SCREEN
- Tap PHONE CONTROL
- Tap NETWORK LOCK
- Tap PERSO SHA256 OFF
- Press Menu and then Back
- Tap COMMON
- Tap NV REBUILD
- Tap RESTORE BACK UP
- Now your device will freeze, but don’t worry. Be patient and press Menu when you can, then Back key ON.
- Your device will now reboot.
Now your Samsung Galaxy S4 should be SIM unlocked.
We can’t guarantee this method is going to work, but if it doesn’t then you can try the alternative method, which requires you to buy an unlock code.
First you will need to find your IMEI code. You can find it either by going to Settings > About device > Status or by dialing **#06#*.
Then head over to DoctorSIM and purchase an unlock code for your IMEI.
Another alternative would be to contact your carrier, because it might unlock your device for free or for a fee.
If you encounter any issues while SIM unlocking your Galaxy S4, please let us know.