That means 500 million GPS phones walking around in cities and towns, creating a powerful two-way sensor network that Nokia and others can tap for selling targeted advertising, friend-finder services and city guides.

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Imaging-wise, and yes, it's still all about the camera with Nokia, there's the same 8.7-megapixel camera sensor from the 920 model, although Nokia says it's made countless improvements to noise-reduction algorithms and other inner workings.

ENGADGET

Nokia has added a front-facing VGA camera to this model (a first for an entry-level Nokia Windows Phone), while a 5-megapixel sensor and flash are centered on the back.

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The new Nokia N8 smart phone boasts a really nice camera, with a 12 megapixel sensor and Carl Zeiss optics.

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Unlike the emergency feature on your keyfob, which sounds a loud alarm and notifies potential kidnappers that you're a fighter, the Nokia phone pretends that it's off when it's actually using every available sensor to suck in data about your location and captors.

ENGADGET: Nokia's cellphone for kidnap victims

Nokia has also announced that it was buying Earthmine - a Berkley-based firm that uses sensor-equipped cars to create 3D street-level views.

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