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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.