Looks like T-Mobile will be adding an LTE-enabled version of Samsung Galaxy S III to its portfolio. Such a device has been caught at the FCC and from what we can tell, it has Magenta colors all over it. Not only is it marked as Samsung SGH-T999L (the original SGS3 was SGH-T999), but it can also sing along 3G networks at 1700MHz frequency (in addition to 850 and 1900 MHz bands). That said, we can clearly see that Samsung wanted to make this model ready for two GSM network giants in the US — AT&T and T-Mobile — just in case you decide one of them offers better deal for your specific needs. In any case, we look forward to see this bad boy hitting T-Mobile’s offering in the near future, when we’ll get back to you with more information.