On every platform (iOS, Android, WP) there should be a BGG app available. However it will limit to searching for games, recording plays, browsing collection, etc.
If you're looking for an app that also contains interaction with the boards, I'm not sure if something like that other than the browser on the mobile client itself exists.
I don't see any reason why it would cut any functionality. All it would need is a layout change.
Might take a while to sort everything, but I'm sure it would be worth it.