waste of time
5G sounds like it may be useful for things like fixed wireless communications. AT&T struggles to get their 4G LTE stuff working most of the time. I can recall two situations in the past 5 years where I got above 20Mbit on LTE. Most of the time it is below 5Mbit. One was in a San Jose hotel (another time I was at another San Jose hotel and the LTE was sub 1Mbit). The other time was at a Las Vegas convention center where they obviously had LTE repeaters or whatever you call them in the room.
Too bad fixing coverage doesn't sound flashy like 5G.
It's not my phone either have tried at least 3 different phones side by side the coverage is quite similar. I have seen many times where I have "good" LTE signal strength(as measured by an app that looks at the numbers), but not enough bandwidth to resolve any DNS entries.
(AT&T customer since about 2010 or so, I switched from Sprint in order to use Palm/HP Pre GSM phones at the time currently have Galaxy note 3s and Sony XZ1 on their network). When I was on Sprint of course it was far worse at the time anyway, their Wimax 4G was slower than their 3G (I had a Sprint mifi hotspot at the time and despite unlimited 4G Wimax it was so slow I configured the device to stay on 3G even though it was no longer unlimited). Changing to (then) AT&T's HSPA+ it was easily 4-6X faster than Sprint. I'm sure Sprint has improved a bit since that time, bad performance wasn't the only reason I left 'em.