Next time you pick up your mobile phone, try to imagine how futuristic it would look to someone from ten years ago. Back then, mobile phones were far less sophisticated devices. Brick-like, they had tiny monochrome screens and ungainly protruding aerials, and they were only used for one thing: talking to other people. Today's latest models, in contrast, are elegantly shaped pocket computers. Your current handset may well have a large colour screen and a built-in camera; as well as being a telephone, it can send and receive text messages, and may also serve as an alarm clock, calendar, games console, music player or FM radio.
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