The Brainwork behind Smart Phones

Researchers are devising pricey new features, extending battery life -- and trying to get subscribers to buy and use all these new gadgets

If more than 150 million Americans already have a cell phone, how do you sell them more? The wireless industry's answer: Be everything to everybody. In the past few months, handset maker Nokia (NOK ) has launched the N-Gage, a GameBoy-meets-cell-phone gadget; the 3300, an MP3 player-meets-cell-phone model; and the 7700, a TV-meets-cell-phone device.

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