turning off IPv4 ... was harder than I expected it would be This is followed by reasonable reasons they struggled to unwind themselves from IPv4 (for the exper

turning off IPv4 ... was harder than I expected it would be This is followed by reasonable reasons they struggled to unwind themselves from IPv4 (for the experiment) - but eventually got it worked out. Conversely: When I hotspot from my phone, T-Mobile frequently makes that an IPv6-only experience.