The most attractive services will probably be those that combine voice and text in a clever way: users could, for example, ask for an address and get driving directions on their cell phone display.

ECONOMIST: Internet

The latest attempt--a joint venture with Sony--produced a sleek model with a built-in camera and the ability to combine text, graphics, photos and audio clips, but Ericsson has lost market share.

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Such wearable computers combine physical reality with augmented video, text or other types of data to provide a distinct interactive experience.

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