@jack, for your IPv6 questions, I can't relate to your server software or Android, in particular. But you need IPv6 on your phone, on your border firewall (I assume, as you're posting here with IPv6, you have that already), in your server OS, and in your server software. I'd start by testing with test-ipv6.com or ip6.me. Those services can tell you if you have reachability to the IPv6 Internet from your cell phone with Wi-Fi disabled.
Good luck and have fun on the IPv6 Internet! The water's lovely. And you'll find, too, that there's much less port-scanning in here.
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