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Cover of What Happens When You Make a Call?
Hidden Journeys · Volume 3

What Happens When You Make a Call?

Follow Your Voice Through the Cellular Network

What happens between saying “hello” and hearing a voice on another phone? Follow your voice as it becomes digital information, travels by radio signal to a cell site, moves through the cellular network, and reaches the person on the other end. Young readers discover the hidden technology that makes a phone call possible.

Ages 6–10 years
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Follow a package from the moment an order is placed to its journey through warehouses, trucks, sorting facilities, and the final trip to your door.

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