Why don't you just install Tapatalk? I installed it on the Vbulletin forum I own and it really just takes a few minutes and doesn't interfere with the normal forum. You need access to both CPanel and the Admin CP and Tapatalk supports IPhone and Android phones. Members have to buy the app for a few bucks but it then will work for any VBulletin forum you belong to which has the app installed in their root directory.