Create a cell phone-based home security system. The system would include small, wireless video cameras hidden around a person's home, and a receiver (with a built-in telephone) that would continuously monitor the cameras. A person with a camera-type cell phone could call their receiver and monitor what the cameras were viewing. You could keep an eye on your property from anywhere, and call the police if you see someone breaking into your home. Of course, this idea requires the development of cell phone infrastructure technology capable of transmitting real-time video.
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