This is pretty cool. I had no idea a smartphone was able to communicate with another smartphone 70 meters away. I had always thought that the reason a smartpho

This is pretty cool. I had no idea a smartphone was able to communicate with another smartphone 70 meters away. I had always thought that the reason a smartphone can communicate with a distant WiFi network, or a cellular tower, is because the recipient has a large antenna, which means it can send data over long distances, and pick up relatively weak signals up over long distances.