It often is difficult to visually represent how much more bandwidth millimeter wave spectrum represents for mobile operators. Here is one way. The yellow rectangle shows the relative spectrum available in the low bands between 600 MHz and 850 MHz.
The orange rectangle shows the mid-band resources in the range between 1.9 GHz and 6 GHz or so.
The red rectangle shows millimeter spectrum presently licensed, up to about 70 GHz. But the millimeter wave radio spectrum extends up to about 300 GHz in frequency, and almost all of it has not been used for commercial communications applications and networks such as mobile networks.
Millimeter spectrum matters for coming mobile networks because most of the other spectrum already is licensed for other purposes and users.
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