We already have a guide covering how to root International Galaxy S3, but there seems to be a different process for the T-Mobile and Sprint Galaxy S3. No problem, here’s a guide for you to root your smartphone on the said careers. Once you have rooted your smartphone, you can install the root-only apps as well as you will be able to modify the system files to tweak your phone. Follow the steps given below to begin rooting your phone.
I. Before You Begin:
1. Rooting your phone will void its warranty. However, the stock firmware or unrooting your phone will help you get back your lost warranty.
2. The following root procedure works on T-Mobile and Sprint Samsung Galaxy S3 only. You can find the rooting guide for the International Galaxy S3 here.
3. Make sure your phone has at least 60% of battery life left to go through the process without any issues.
II. Downloading Required Files:
1. Download the Galaxy S3 Drivers from here. (Official Samsung Website)
2. Download the CWM Superuser from here. (File is attached there in the post)
3. Download the clockworkmod.TAR from here. (It’s also attached there)
4. Download the Odin Tool from here. (Download it from Attached Files section)
III. Rooting T-Mobile and Sprint Galaxy S3:
1. Place all the downloaded files on the Desktop of your PC.
2. Install the Drivers for your Galaxy S3 that you downloaded from the official Samsung website.
3. Enable USB debugging on your smartphone by navigating to Menu>>Settings>>Developer options.
4. Connect your smartphone to your PC using the USB cable that came with it.
5. Transfer the CWM Superuser file to the Root folder of your phone’s SD card.
6. Disconnect your phone from the PC after you have successfully transferred the file.
7. Turn OFF your smartphone using the Power button.
8. Reboot your phone into the download mode. To do that, press and hold Volume DOWN+Home+Power buttons together.
9. Press the Volume UP key when you are asked.
10. On your PC, extract files from the Odin archive onto your Desktop.
11. Double-click the Odin executable file to launch the tool.
12. Connect your phone to your PC using the USB cable.
13. In the Odin tool, select PDA tab and then choose the clockworkmod.TAR file you downloaded earlier to your PC.
14. Make sure that Auto Reboot is UNchecked and F. Reset Time is checked in the Odin, leave rest as unchecked.
15. Click on the Start button to begin flashing the file to your phone.
16. As soon as the flashing completes, your phone will reboot.
17. When your phone boots up, turn it OFF by pressing the Power button.
18. Reboot your phone into the Recovery mode. To do so, press and hold Volume UP+Home+Power buttons together.
19. Now, in the recovery menu, select install zip from sdcard followed by choose zip from sdcard option.
20. Browse to the CWM Superuser file you transferred to your phone and select it for flashing.
21. Choose Yes when you are prompted for flashing process.
22. When it has finished flashing the file, simply select reboot system now from the recovery menu.
23. When your phone restarts, head over to the Google Play and download the BusyBox app. Install it on your phone.
24. Open up the BusyBox app and follow all the instructions displayed on your screen.
25. Open the Superuser app and navigate to Settings>>Su binary>>Update. Update the binaries to latest ones.
Congratulations ! Your smartphone has now been rooted and you can install any root-only app right now on your phone.
If this procedure helped you, then please head to the official thread over at XDA Forum to thank/donate to the original developer of this root method !