AT&T is using equally high microwave...uh, mmWave...frequencies, but their customers can't move around (they don't have any mobile devices, yet) so the effects are less of a problem...for now. Interestingly, T-Mobile issued a post about Verizon and AT&T's 5G performance, which is clearly one-sided in favor T-Mobile, but it does portray a view of how many hurdles each carrier has getting to 5G-nirvana.
Related: Millions of Cell Sites
We agree that it's really early in the process, but if the carriers are depending on frequencies above 3GHz, universal 5G coverage is l o n g way off. Visible light is on equally high frequencies and you get an approximation of how limited coverage can be if you set up a light bulb on a phone pole and observe how far away you can see it...literally! That's "line-of-sight." Those channels do have potential for fixed wireless access, but mobile access will probably need much lower frequencies...like the ones T-Mobile are about to use.
C Spire Wireless in Mississippi is running fiber to certain customers' homes and then connecting neighboring homes with a wireless link from an outside antenna. It works, but at what cost? Someone will get this right, but they haven't, yet.
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