You might be already in the minority here (even in the USA !), as it looks like that the cell carriers there now overwhelmingly run on IPv6, and tunneling IPv4, which doesn't always work well ?

https://old.reddit.com/r/tmobile/comments/97ifsv/issues_with...

I am in EU - Czechia. I have 5G, but unable to connect to any IPv6. :-/

I have the same network ISP for my apartment and they give me only IPv6.

I hate it.

That's weird... have you tried to find out what was the cause for lack of 5G (!!) IPv6 ?

In many parts of the world it's no IPv6 on mobile, just CGNAT with probably thousands of customers sharing one ip.