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The first mobile phones that appeared had large dimensions and only one main function - making calls, but they still managed to become the beginning of something bigger. For 20 years, a variety of models have been produced: monoblocks, clamshells, sliders, communicators, camera phones. But since mobile phones were considered by buyers not only as a means of communication, but also as an accessory, manufacturers gradually improved. A color display and polyphonic sound have been added to the standard set of functions for making calls and sending messages. The ability to connect a headset, the presence of a camera, infrared and Bluetooth functions for data transmission. The first mobile phones that appeared had large dimensions and only one main function - making calls, but they still managed to become the beginning of something bigger. For 20 years, a variety of models have been produced: monoblocks, clamshells, sliders, communicators, camera phones. But since mobile phones were considered by buyers not only as a means of communication, but also as an accessory, manufacturers gradually improved. A color display and polyphonic sound have been added to the standard set of functions for making calls and sending messages. The ability to connect a headset, the presence of a camera, infrared and Bluetooth functions for data transmission. The first mobile phones that appeared had large dimensions and only one main function - making calls, but they still managed to become the beginning of something bigger. For 20 years, a variety of models have been produced: monoblocks, clamshells, sliders, communicators, camera phones. But since mobile phones were considered by buyers not only as a means of communication, but also as an accessory, manufacturers gradually improved. A color display and polyphonic sound have been added to the standard set of functions for making calls and sending messages. The ability to connect a headset, the presence of a camera, infrared and Bluetooth functions for data transmission.