iOS 3.0+ compatibility for iPhone app

I've released an app but forgot to set the compatibility to iOS 3.0+, can I make an update开发者_如何学运维 to support 3.0+ and how? Should I just change the deployment target to 3.0 and is there a way to test it in simulator for 3.0? I only have 4.2 and 4.3 for debug...

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Change your deployment target to iPhone OS 3.0 and test on device with iPhone OS 3.0.

Not only is it bad practice to even consider deploying to App Store before testing on device. If version compatibility is your concern it is doubly so, since the Simulator is far from perfect when in comes to testing all version incompatibilities.

Also ask yourself if you really need to support iPhone OS 3.0 users? All studies made tells us that around 95% of all users are running on iOS 4.0 and later.

A user who can not be bothered to update to the latest OS version for free, is not likely to pay for your app.

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change your deployment target to 3.0 and test it in the simulator. If all goes well, submit it as an update - exactly as you described.

When you change deployment targets to 3.0, you should be able to select the 3.0 simulator in the schemes.