Please tell me which version of the iOS SDK i should use so that my app works on iPhone 3.0 or later.
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Please tell me which version of the iOS SDK i should use so that my app works on iPhone 3.0 or later.
There are two different concepts you should be aware of:
The Base SDK
This is what you use to build your application. The most recent release is 4.2 so you should use that to build your applications against.
The iOS Deployment Target
This is the target version of iOS you are building for. In your case, you set that (in Project or Target settings of Xcode) to “iOS 3.0”.
The rest is up to you. You are, of course, building for many versions of the SDK, so if you use something that was introduced in any SDK after 3.0, you need to test for that functionality explicitly.