Ah. So, troop231, you're talking about checking the iOS version as a supplementary feature of a regular app and not as the sole purpose of the app, is that right? If so, sorry, I wasn't able to gather that from your posts. If that's the case, Apple would probably not reject it on that basis alone. But then the question becomes: what is the benefit, to the end user, in terms of your app alone, of having them upgrade their OS to the latest version?