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by Skeuomorph 6193 days ago
Yes, "something else" the iPhone supports in OS 3.0, which is "push notifications".

These is a background notification service any iPhone app can use that can show a text message on the screen and update a counter (aka "badge") on the icon of an app that isn't running.

Push notification in iPhone OS 3.x is not to be confused with Exchange or ActiveSync so-called Push email.