how to show my mobile carrier assigned ipv6 address?

I looked up on the web the way to show my ipv6 address.

All of them teach to open wifi and check the connected wifi info. First, I do not get assigned with a ipv6 on both of my iphone and ipad. Only 1 ipv4 wifi address shows.

secondly, i want to use ipv6 is because i'm trying to connect my NAS using ipv6. My ISP doesn't allow me forward ports. Most likely i will need to use IPV6 with my mobile carrier. It won't be WIFI. It's going to be 4G signal.

How do i get my mobile carrier's ipv6 address?