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Well, any 3G or later mobile backbone is SIP+SCTP over IPv6. So in many ways it won already

My phone, on 4g, is not IPv6

At home it can be if I connect t to my ip6 ssid, but there’s a stateful firewall which may as well nat.

What your phone shows to app land is entirely different thing. I'm talking about the backbone.

Weird, I used to remember that going to test-ipv6.com on my mobile (on 4G and 5G) used to fail all the tests. But today it passes.

Well, good to know!