Radio waves to send and receive the sounds that would normally travel down wires. How does it do this? By using electromagnetic What'sĭifferent about a cellphone is that it can send and receive calls without wireĬonnections of any kind. Travel down a direct, wired connection between two handsets. Offices, and other razzmatazz, and land lines are not that muchĭifferent to the toy phones you might have made out of a piece of Cut out all the satellites, fiber-optic cables, switching Now networks are faster and capable of handling greater volumes of traffic, smartphones are used as portable communication centers, capable of doing all the things you can do with a telephone, digital camera, MP3 player, GPS "sat nav," and laptop computer.Īlthough they do the same job, land linesĪnd cellphones work in a completely different way. Back in the 1990s, cellphones were simpler and could only be used for making voice calls. Small computers with cellphone circuitry built in. Photo: Most people now use smartphones as their cellphones, which are actually Network of masts linked to the main public telephone network. Mobiles) are radio telephones that route their calls through a Wired to the wall) are few and far between, over 93 percent of the phones in use areĬellphones (also known as cellular phones and, chiefly in Europe, as mobile phones or That's more than the planet's population! In developing countries, where large-scale land line networks (ordinary telephones Plastic handsets there are in the world, but the current estimate is that there over 8.3 billion subscriptions. Train, always in contact, never out of touch-cellphones have dramaticallyĬhanged the way we live and work.
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