The Nokia N900 only runs Maemo 5 in landscape mode for the most part, besides the phone app, photo browser and some other 3rd party applications. However, Guyver from talk.maemo.org managed to accidentally run his Nokia N900 in portrait mode by tilting the phone to launch the phone app, and then sliding the phone open before closing the phone app. Looking at the video makes it seem pretty feasible to implement this feature to enable users to control their device with a single hand.

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