According to a leaked recent Nokia presentation Windows Phone users will have to wait till Apollo before they can connect to IPv6-only networks.
In the middle of last year it had been believed Windows Phone 7 Mango will support IPv6 due some entries on Microsoftâ€™s Mango .net documentation, but in practice on IPv6-only networks Windows Phones are not able to get IP addresses.
As can be seen from the graphic above while IPv6 support is very variable, Windows Phone has the poorest support amongst the major and not so major operating systems.
2012 is meant to be the year of the big IPv4 to IPv6 change-over and while most IP services offer IPv4 fall-back, in Asia where IPv4 addresses have already run out Windows Phone users will find themselves unable to connect to some websites due to lack of the appropriate networking support.
Chalk this up as another reason why for some Windows Phone 8 could not come fast enough.