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Similar to the “AT&T Note 2 AWS MOD to enable T-Mobile AWS 3G/4G bands”, we can also do something similar with the AT&T Galaxy S4 SGH-i337 or Canadian SGH-i337M.
What this will do?
You will be able to enable the AWS bands (which is the bands used by T-Mobile for 3G/4G HSPA+ service) on your AT&T Galaxy S4 SGH-i337 (or Canadian SGH-i337M) and receive 3G/4G HSPA+ data when using T-Mobile SIM card (or other Canadian networks that support AWS).
UPDATE: T-Mobile 4G LTE also works with this method!
In layman’s words, you can turn your AT&T Galaxy S4 into a full-fledged T-Mobile Galaxy S4.
Step 1. Go ahead and install Phone Utility app by downloading and installing phoneutil.apk:
Step 2. Dial “*#7284#” on your dialer.
Step 3. Choose “Qualcomm USB Settings”.
Step 4. Choose “RNDIS + DM + MODEM” and hit “OK”.
Step 5. Connect a micro-USB cable from your phone to your computer.
Step 6. Make sure you have Samsung drivers installed. If you did everything correctly, you should be able to see some kind of “SAMSUNG Mobile USB Serial Port” under “Ports” in Device Manager.
Step 7. Download QPST program and run the EXE file to install QPST program and also download the QCN file with AWS enabled.
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!