The OnePlus 6.5" 1080 screen with a 90 Hz refresh rate. It has a 64 megpixel main camera and three other cameras. A 30 watt charger is included. (Take that, Apple) The Qualcomm Snapdragon 690 is fast enough for almost all practical purposes.
T-Mobile already covers a third of the US (100M+ pops) with mid-band 5G. CTO Neville Ray says median speeds are 300 Mbps, although that may go down as the network gets loaded. Neither AT&T nor Verizon has mid-band spectrum yet, so T-Mobile has a customer pleasing speed advantage. (There is almost no advantage to 300 Mbps vs 50 Mbps, but customers love it.)
You can buy the phone on Jan 15 through T-Mobile, which will give you $13 off a $60-$80/month plans. If you don't need much data - most of us these days - you can use the phone on the $20/month prepaid 2 gig plan.
OnePlus will sell you the phone, unlocked, with a $30 discount if you sign up for its mailing list by Jan 15. Apparently, you also get a $50 pair of wireless earbuds, although the website wasn't clear.