Reason being, the market is limited by region. As such, you have to Root your device. Think of it as something similar to jailbreaking an iPhone/iPad. The process is not harmful to your device nor is it permanent. Removing the root can be something as simple as restarting your device.
Here goes:
Getting the files needed
- Download Z4Root from here. Thanks to the RyanZA from XDA forums for this.
- Copy the file onto your device.
- Go to the Android Market and look for File Expert. Find it and install it like any other app you have in the past.
- Download MarketAcess from here.
Remember to only install File Expert. Do not install any of other files yet. Follow the steps below once you have done the above.
Rooting
- Launch File Expert.
- Browse to the location where you saved Z4Root. Tap Z4Root to install it.
- Go to your settings page. Go to Applications. Go to Development. Select USB debugging
- Go to your applications and launch Z4Root.
- Select Temprary Root.
- Let it do its thing. After a while, it should say Temporary Root Successful. You have now successfully rooted your device.
- Next, launch File Expert again. Browse to the location you copied Market Access to and install it.
- Launch Market Access.
- Select Backup Value. After the confirmation pop-up, select the Providers tab at the top. Select T-Mobile [US].
- YOU'RE DONE !!!
* Please note that this apparently doesn't work with the latest firmware update from Samsung. This just serves as a guide and I am not responsible for any damage caused to your device.