I'm just outside of one of AT&T's 5G "launch" cities in which Verizon also set up shop early on. Over the last year, Verizon popped up a lot of of mmWave sites in my neighborhood. I think I've come across a few that might be AT&T's—they look kind of like what Verizon is doing, but are using different hardware and are right next to Verizon ones. Currently, the line I'm running on AT&T's network is on Cricket and I'm getting decent speeds on low-band 5G or multiple-carrier-aggregated LTE, but I'd be curious to see what I can get at a "5G+" site if I can find one (supposedly my plan supports it).
It seems that the Cricket carrier bundle on iOS only shows "5G" regardless of the type of connection (no "5G+" display like AT&T proper), so that makes it a little tougher to spot, too. Then again, I was running into this with n71 vs. n41 on T-Mobile, too (same indicator for everything, kind of tell with either Field Test or running a speed test).
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