Apparently the latest point release of the forum software includes code that can display the forum differently according to the type of device accessing it.
But it's not clear how developed this feature is and I've not seen another forum using it yet.
To be honest, much as I would like to have a mobile view, the software is a pig to play around with and I've never attempted an upgrade for fear of breaking the forum completely!
However I'm looking at various options, as a mobile view is right at the top of the list.