The Astonishing Tribe, a Swedish company that specializes in creating mobile interfaces, have been experimenting with different kinds locking and unlocking mechanism on mobile phones. Interesting (well, some of them...)
Turn you phone upside down to lock it... which is pure genius, since this is pretty much how everyone puts their phone into their pocket anyway.
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Which I think might be a better solution than the slider on Apple's iPhone
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Spin the globe to your location to unlock...
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Unlock you phone by playing a pre-specified drum solo
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Writer, Project Manager and Interaction Designer
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heh... :)
Why the hell has no-one thought of locking the phone when upside-down!? The world has not yet met a true lead designer for cell phones.
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Published: October 11, 2008 
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Jonathan
Very nice ideas they've got there.
BTW "tat" is slang for "ugly cheap stuff" in English, which is unfortunate, if slightly funny.