IPv6 dual stack support for mobile network on iPhone

Hi,

I have a new iPhone 6s with iOS 9.2 installed and want to have a IPv6 address from my mobile network carrier (German T-Mobile). This now already took my hours of research on the web and on the phone to get where I am now. I've already got in touch with the T-Mobile Support and asked whether there are any problems with IPv6 support. But T-Mobile stated that their APN already support IPv6 on dual stack basis. So I thought my iPhone is using the old APN without IPv6 support. As it's obviously no longer possible to change the APN settings manually within the cellular settings in iOS, I used the Apple Configurator 2.2 instead to manually create a profile with the new IPv6-ready dual stack APN settings from T-Mobile, i.e. "internet.t-mobile" or "internet.telekom" and I installed this profile on my iPhone. But unfortunately this didn't work neither. I still don't get an IPv6 address.

Now I read the information that it seems that iOS does not support dual stack (IPv4/IPv6) for mobile networks. Could anybody confirm?

Is there any release date by when Apple will support this? Or is there any workaround to get this done?

Thanks and regards

Julian