This is big in Europe for quite a time now.
Things are getting set up in US, but it costs quite some cash to get it going as the major providers want large cuts of course, also they bitch when it comes to adult / porn on their networks.
I have some good ATT contacts that are on this, I'll let you def. know when it's launched to the public.
With this market the US is far behind and the European guys have the experience with this
Steve