The enthusiastic high-fives of future iPhone instant messaging users yesterday might be quite a bit less enthusiastic today when they find out that Apple is not going to allow user-made SDK applications to run in the background. This means every application, from IM to VoIP to GPS mapping, will have to terminate entirely when the user switches out to take a call or change a song. How does this affect you? It means you won't be a be able to receive IMs unless you're currently inside the IM app, forcing you to disconnect when you take a call. There's an upside and a downside to this decision.
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