I've been looking into how I can make vB4 more functional for the mobile phone users, but tbh, it's not going to be easy. A scaled down style isn't the solution, neither are mods like ForumRunner which work partially, but lose most of the functionality, especially with regards to the addons you can install. There's another similar one called Tapatalk which is supposed to allow more phones to access better, but still researching it.