"Just be doing dual stack" is not as easy as it sounds. The whole point of a carrier doing 464XLAT is that they (the carrier) can move to a IPv6 only network w

"Just be doing dual stack" is not as easy as it sounds. The whole point of a carrier doing 464XLAT is that they (the carrier) can move to a IPv6 only network without breaking the internet experience for their customer until everyone else is also accessible over IPv6.