6T made by OnePlus as Sajo said. OnePlus is actually a subsidiary of Oppo (big co).
It's fast. Very fast. Holds programs in memory longer then any phone I've used, thanks to 8gb of ram. Build quality is excellent. Naked, it feels very lux. Screen is gorgeous. Runs on its own OS (called Oxygen) that is so close to stock it could fool the best of us. But with cool additions like changing the quick toggle colors...to ANY color. See attached. Battery life is sick and OPs Quick Charge tech is the 2nd fastest there is behind only Pocophone F1 by...Oppo. This is the first phone I've had that comfortably goes 2 days with medium use. The tear drop notch is unobtrusive. You can also use screen gestures while the screen is dark (witchcraft) and I set mine to draw V for flashlight. Finally something close to Moto's class leading chop. Price starts at $550. Has a hard button slider for Ring, Mute, Vibrate.
Cons: Camera is just ok. Proprietary cable and charger needed for Dash Charge as they call it
That's it. Shines in every other way.
Re: 5G. Pretty sure it's not live in any city yet.
Re: Z3. it's really not a bad phone. Coworker that I convinced to get a Z1 just did not want to pay full price for a phone. VZW had a Black Friday sale on the 3 and she got it. So for like $250 she got a Z3. I set it up for her. Fingerprint reader is on the side and works great. More screen then the Z2. It is a worthy upgrade for a Z1 user, no question.
She's loving it. She never set up the FP reader on her Z and I didn't push it hard. I did this time and that side reader works damn well. She loves it. And her battery goes all day.
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