Motion sensing has found its way into remote controls, laptop computers and video-game accessories. Now it's in cell phones too. Recently Samsung debuted the SCH-S310, the first mobile with "3-D movement recognition." Wave it in the air, and it interprets your wandlike gestures. In normal use, shaking the phone twice ends a call. Draw a 3, and it types the digit. Make an X, and the phone generates the voice response "no." If you're listening to music on the built-in MP3 player, you can jerk the phone to the right to skip to the next track. Best of all, the phone's...
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