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Cell phones have changed the way we live, work and play. Nobody knows exactly how many small plastic handsets there are in the world, but the best guess is that there are about 7.9 billion subscriptions. That the population of the planet. In developing countries, where large-scale fixed networks are scarce, over 90% of phones are cell phones. Cell phones are radio phones that route their calls through a network of masts connected to the main public telephone network. Here’s how they work. Cell phones use wireless technology. Even if they do exactly the same job, landline phones and cell phones work in a different way. Calls are carried by fixed lines as well as electrical wires. Cut out satellites, fiber optic cables, changing desks, with other razzmatazz, and fixed lines are not so different from the toy phone that you could have made from a piece of string and a number of boxes of baked beans. The words you are finally talking about traveling down a direct and wired connection betwe...