While not being completely sure on which minimum version to target I did some research into the most used platforms the full results can be found on my blog (http://mygamingproject.blogspot.com/2012/01/which-mobile-platform-version-to-build.html) but in summary if you are targeting Apple devices go for 4.2.1 and above to maximise your audience and for Android target Froyo and Gingerbread to hit 85% of the android market.
Hope this is of some help [import]uid: 103970 topic_id: 20271 reply_id: 320271[/import]