the theme (and vB) relies on cookies to set the theme correctly. If your mobile browser accepts cookies, cool. If not, every time you try to change pages, it's going to revert to the old theme.
As much as I'd like to change that, there's no workaround.
As for the theme, it's an off-the-shelf freebie that was created for an iphone hacking site (hence the blue arrows which aren't even links, though I may be able to fix that). I have NOT made any changes to the defacto template (even the name hasn't changed... silly me).
Anyone who wants to help me amigatize it is more than welcome to send me the appropriate icons.