But even beside that, AFAICT USCellular shut down 3G in January 2024, Appalachian Wireless in Dec 2022, Cellcom in Dec 2023, and C Spire sometime in 2022.
I'm interested to know where exactly public 3G still exists in the USA.
I gotchu, but I wanna be clear that it is all just fringe/regional operators (which is what the claim was originally about anyway, not about major telcos).
I found a couple with user reports claiming 3G support still being active in random pockets of Wyoming/Colorado/etc. (but no confirmation on the official website), and one with confirmation on the official website.
The one with the official confirmation is Union Wireless[0], with UMTS being a stand-in for 3G (color-coded in grey on their coverage map; mostly southern Wyoming plus parts of Colorado, Utah, and Idaho).
I agree with your overall point though. Functionally, 3G is dead in the US. But factually, there are a few holdout fringe remote areas that still have it.