When I minimise any app in my iPhone Does that app runs in background? or Pauses? or stops the app?

The app goes to the background and stays there as long as it can. If memory gets short, the app terminates.

The app goes to the background and stays there as long as it can. If memory gets short, the app terminates. How the device handles background application is more a function of the iOS than the device.

Even 2nd generation phones running iOS 4.0 have multitasking.

IPhone 3G doesn't support multitasking, only 3Gs, 4 and iPads. As for background tasks, you have to implement background functionality, like playing music or downloading something or sending local notifications, by yourself.

Thanks for the answer – George Sep 8 at 7:05 3G is able to run 4.2.1 so it supports multitasking. – Jano Sep 8 at 7:18 Running iOS4 doesn't mean the device supports multitasking. 3G supports multitasking only on jailbroken devices with Cydia and Backgrounder installed.

– Kyr Dunenkoff Sep 8 at 7:21.

Look at UIApplicationDelegate Protocol Reference. In discussion part of method called applicationDidEnterBackground: you can find answer on your question.

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