Orange HD Voice on GS2?


Android Expert
Just wondering if anyone of you on here are in the know with Orange.
I'm amazed that their HD Voice service is not on the GS2.
Is this reason due to hardware or will there be a tweak some time in the future on the Orange network to enable this for us? If so, will this be automatic, or do we need to activate it manually?

Has anyone used HD Voice on another handest? If so, what is it like?