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Case in point: this iPhone app, called PSN Status, has only one simple feature: it checks if the PSN network is offline or online.
Since Sony started restoring PSN a couple of days ago, the app is not as useful as it would have been a month ago. However, with a constant stream of reports about new hacker attacks on Sony's servers and services, it's not that hard to imagine the PlayStation Network going dark again.
The app is available for free in Apple's App Store.