I tried a few months ago and can enable IPv6 on my LG V20 (on Telus LTE) and it does indeed pick up an IPv6 address but test-ipv6.com complains of MTU problems.

I tried a few months ago and can enable IPv6 on my LG V20 (on Telus LTE) and it does indeed pick up an IPv6 address but test-ipv6.com complains of MTU problems. Sites did load over v6 but it was slow compared to v4. Progress