Yes, Unlocked Note 20 Ultra will work with US Cellular as long as its this model #: SM-N986UZNAXAA.... you should really get it from US Cellular or maybe Samsung.com
I bought two of these phone unlocked mystic bronze from Best Buy on 08/21/20 and it has been dud for me and Best Buy is not honoring the returns for me and I am Best Buy Elite Plus member and Best Buy will charge restocking fee as well. I will explain below why I want to return these phones..
Well, $150 Samsung Credit is over with but if you buy this phone from Samsung.com, they are giving away free Wireless Duo Charger with it. I would recommend buy it from Samsung.com because they will take return and replace if anything happens to the phone with no restocking fees..
I am avid Note series users ever since (2011) they been in the market. But this new NOTE 20 Ultra is a dud for me. It's been 3 days I got this phone and let me tell you it has been draining battery in like 5-6 hours and its getting super hot.. so hot that it making me uncomfortable while holding.. and I am only using at 60hz with all the bloatware disable/uninstall.. Best Buy won't take a return because apparently their employee said that it will be another Note 7 fire disaster back in 2016.. it will be another Note 7 nightmare..
this new phone of mine is getting ridiculously hot and battery just keep dying and Samsung won't help unless i bought it from them...
I humbly apologize for a very long message but you can see my frustration with Best Buy and Samsung about these phones i bought only 3 days ago..