As the post stated, US Unlocked S21 Ultra cannot download OneUI4.0. This is starting to get frustrating with Samsung. Especially when ur seeing all the carrier phones getting the update. This is a slap in the face to how Samsung treat their unlocked customers. Which always get updates late or after carriers devices.
I have unlocked s21 5g on the mint sim 12 month plan. I pay $250 for 12 month of service I get 10gb data at 5g a month and unlimited talk and txt that's super cheap which is why I went for unlocked device. Carriers stink becuase it all about the profit and getting business to them so the people buy the locked device and pay more $$ for same service.