T-Mobile tells the FCC that it needs more mid-band spectrum for 5G service in the states

The reason why wanted to merge with Sprint had to do with the latter’s holdings of 2.5GHz mid-band spectrum. T-Mobile’s plan for 5G, dubbed the layer cake approach, takes advantage of the individual characteristics for low-band, mid-band, and high-band spectrum. Low-band airwaves travel long distances making them perfect for the foundation of the cake. They can easily bypass structures. The one thing that they cannot do is deliver download data speeds much faster than 4G LTE. High-band spectrum can only travel short distances which is why they are appropriate for urban locations and cities. …
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