T-Mobile is reportedly getting ready to add two more Android devices to its portfolio. These are the Samsung Galaxy J7 and the LG K10. According to a couple of leaked internal documents from the carrier, both of these will be launched on May 18, which is next Wednesday. The Galaxy J7 oddly isn't this year's model, but the one from 2015. That said, it does come with certain improvements compared to the internationally available handset. T-Mobile's version sports 2GB of RAM (up from 1.5), and it comes with Android 6.0.1 Marshmallow preinstalled. The other specs aren't different from the J7...
Source: http://www.gsmarena.com/samsung_galaxy_j7_and_lg_k10_land_at_tmobile_on_may_18_leak_says-news-18145.php