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For those of you who want to use your Sprint Galaxy S4 SPH-L720 as a GSM worldphone, you can get your unlock SIM code from Sprint.com. Now, sometimes even with that, your phone may not work correctly, here’s how to manually unlock SIM on your Sprint Galaxy S4 so you can use use phone when traveling abroad.
*Note – Currently, this unlock method only supports carriers outside U.S., will not work AT&T or T-Mobile. But I should have an update when there’s a way to do that also.
Before we begin, I suggest you to use a TouchWiz-based ROM or stock ROM for this.
Step 1. Go to Settings->About device and check your Baseband version. If it ends in MF9, you will have to downgrade to MDC. If it ends in MDC or MDL, you can skip to Step 6.
Step 2. Turn your Sprint S4 off then hold down Volume Down, Center Home, and Power buttons together until you see warning screen.
Step 3. Hit Volume Up button to enter ODIN Download mode and connect a micro-USB cable from your S4 to your computer.
Step 4. Next download MDC modem for Sprint Galaxy S4. The file name is “SPH-L720_MDC_Modem.tar.md5”.
What is a Custom ROM?
A custom ROM is a custom, modified operating system that you can install on your Android device. Basically it's like installing Windows OS on a Macbook. By installing a custom ROM, you can bypass stock factory settings like locked hotspot tether, install new Android versions early, or even convert your phone into another OS.
With a custom ROM, you can really maximize the capabilities of your smartphone by adding custom features that have been developed by open source developers.
How to Install Custom ROMs
First, you will need to root your device, if it is not rooted yet, follow our root tutorial and root your phone.
Once rooted, you should have TWRP installed on your phone. Installation of a custom ROM is easy if you learn the basic of it. If you don't know how to install custom ROMs using TWRP recovery, see our tutorial on How to Install Custom ROM using TWRP!