There are billions of mobile phones all communicating with each other sending wireless signals across the globe. How does each signal know where to go exactly, and how are they not intercepted by other signals?
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Ordinary aerials transmit in every direction so the radio wave will bump into a receiving aerial. Throw a pebble into a pond and the waves will reach the side. Bigger pond use a stone. Aerials can be shaped to transmit or receive in one direction. This reduces the power needed.
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