there is an app out there called tapatalk that you can get that shows the vbulletin forums on a mobile device.
it does not cost the forum anything they just have to hook up to tapatalk. You can download the free version or the $2.99 version that allows you to post and send PM's. It would be good if therx would be on there. THere are lots of other forums I visit that use tapatalk and I can use them from my iphone with no problems