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It had to happen. Flip-top cellphones are getting small enough to sit on a wristwatch. Samsung of Korea suggests putting the phone’s circuitry, screen, keypad, mic and earpiece on the top side of a watch strap, while the battery sits on the other side of your wrist (GB 2364614). The battery occupies a special tray that slides out for recharging. You replace it with one you’ve recharged earlier—so you can still tell the time.

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