iPhone App Version - which one to keep?
<p>I just finished my first app developed in XCode 3.2.1 in iPhone Device 3.1.2.  I know that there is iPhone 4 now, does that mean that I have to upgrade to iOS 4 before I submit my app to App Store?  Or do I keep two versions of my app, one is the 3.1.2 version and the other iOS 4 to cover all iphone market (old and the latest one)?</p>
