Behold, the Cell Phone
Credit: Bluetooth Star Trek Communicator

 
Star Trek popularized the idea of a communicator that could instantly connect two crew members on different parts of a planet. To answer the device, you just flipped it open and started talking. Of course, everyone recognizes this device today as a cell phone. Amateur electronics wizards have occasionally made replica Star Trek communicators available on eBay; they use Bluetooth technology to piggyback on your cell phone service.
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