Hi all, Since there are many IOS versions and the new version always evolve eventually, can I know how you all handle the app testing on multiple IOS versions on IOS devices? For example, if I want my app support IOS versions 4.3 until 6.0. Should I need to test the app on various devices which run IOS 4.3 until 6.0? or normally We support the latest IOS version? And so far I only own a IPhone so how can I do testing on various version on devices? I am thinking upgrade the version once done a testing on current version but it seems not a good option because once upgrade I can't downgrade it to test my next app. How can I ensure my app can run well in a device with IOS 4.3 to 6.0? Anyone has any idea or suggestions? Any comments are welcome. Thanks a lot.