Back in September, T-Mobile announced several improvements to its network's infrastructure that would help speed up data transfers significantly. There were two folds to the strategy, 4x4 MIMO and DL-256QAM/UL-64QAM, as well as two devices promised to be compatible with these options first: the Galaxy S7 and S7 Edge.

First, 4x4 MIMO is already available in 319 cities and has the potential to double the data paths between the cell network and phones for better speeds in congested areas. It turns out that 4x4 MIMO was already enabled in the update that rolled out to the T-Mobile Galaxy S7 and S7 Edge back in September, but it wasn't mentioned in the official changelog. 

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