MILLIMETER WAVES: the future of 5G phones

MILLIMETER WAVES: the future of 5G phones? Well, maybe:

[T]hese waves don’t penetrate solid materials very well. They also tend to lose more energy than do lower frequencies over long distances, because they are readily absorbed or scattered by gases, rain, and foliage. And because a single millimeter-wave antenna has a small aperture, it needs more power to send and receive data than is practical for cellular systems.

There's also the 'fear factor' that will have to be overcome. Your microwave oven operates at about 2.5 GHz, just below the lower edge of the millimeter-wave frequency band. and even at the very low powers involved, is sure to cause some public concern.