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Running an IPv6 core and offering IPv4-as-a-service doesn’t really make you IPv6-only.

I'm not sure what you're referring to.

Here's a dude from T-Mobile explaining how they have (in 2017) over ten million end-customer devices without any IPv4 addresses assigned:

* https://www.youtube.com/watch?v=nNMNglk_CvE

For reaching services that are IPv6 only they use(d) DNS64 (with and without 464XLAT).

IPv6-only as a term has been heavily abused. A truly IPv6-only network has no access to IPv4 resources. If it does, it isn’t really IPv6-only and relies upon IPv4 addresses and NAT to work.

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