Its getting to the point where my 2G phone's OS, 3.1.3 I think, is not supported by a lot of Apps that are becoming available in the App store. However for all the core Apps I use regularly it is fine. As I'm not that excited about paying $500 rather than $0.50 dollar for an App because the developer doesn't offer a version for my current OS I wondered if instead anyone knows of a search engine where I can filter / search by OS supported version?