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| − | The microphone converts the sound waves to electrical signals and then these are sent through the telephone network to the other phone and there converted by an earphone, or speaker,[http://dichvuvanchuyen.com.vn/dich-vu/chuyen-nha-tron-goi/chuyen-nha-tron-goi.aspx chuyen nha gia re] back into sound waves. Telephones are a duplex communications medium sized, meaning they allow the people on both ends to talk simultaneously. The telephone network, consisting of a worldwide net of telephone lines, fiberoptic cables, microwave transmission, cellular networks, communications satellites, and undersea telephone cables connected by transitioning centers, allows any telephone in the world to communicate with any other. Each telephone line has an identifying number called its telephone number. To initiate a telephone call the user enters the other telephone's number into a numeric keypad on the phone. Graphic symbols used that will designate telephone service or phone-related information in print, signage, and other media include .[http://dichvuvanchuyen.com.vn/dich-vu/chuyen-van-phong/chuyen-van-phong.aspx dich vu chuyen van phong]
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| − | Although originally designed for simple voice communications, most modern telephones have many additional capabilities.[http://dichvuvanchuyen.com.vn/dich-vu/chuyen-nha-tron-goi/chuyen-nha-tron-goi.aspx chuyen nha tron goi] They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music, and surf the Internet. A current trend is phones that integrate all mobile communication and computing needs; these are called smartphones on the market. [http://dichvuvanchuyen.com.vn/dich-vu/chuyen-van-phong/chuyen-van-phong.aspx chuyen van phong]
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Версия 18:33, 25 декабря 2025
