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I also agree that with a newer 5G capable phone with the right app we should be able to have a nice 5G meter. I don't believe the cell phones run on the 60 gigahertz millimeter wave. I too am waiting for an inexpensive meter to come out for this range. 

You can Google 5G frequency graphs to find out which countries are using the higher frequencies such as 60 gigahertz millimeter wave as well as which cellular carriers.