I don't believe it will require Qt 4.7.4, unless I use QSystemInfo for the battery indicator etc. Presumably there are lower-level methods to get battery info and such that would enable me to avoid using the high-level QtMobility APIs. EDIT: Also, I don't suppose you know the answer to my question of how to determine which theme is currently being used? I need to be able to tell my QDeclarativeImageProvider where to load the images from (and also load transistions.ini if the theme overrides the default one).