FSE does not run on VBulletin, but on Simple Machines. I have a couple solutions in progress to try and make it work.
First thing I am doing is registering our site with Tapatalk, which is a very nice looking android app which works well with most android phones and tablets. However, the app is not free and we would prefer something to level the playing field.
I've also installed a mobile theme, however it appears to lack some functionality so I would hesitate to use it.
If anyone knows of other free alternatives let me know.