This book has the following features: basic concepts and concise. On explain the basic concepts to be accurate and refined, making the non-mobile students can understand the meaning of related concepts. According to "transfer technology", "Switching", "access technology" has three major series with the overall structure of knowledge, theory and practice. For some practical, strong technology and product recovery of mobile phone accessories, the book gives the corresponding graphs, charts to help readers in-depth and comprehensive understanding of the specific application methods related technologies to improve to analyze and solve problems capacity. The basic concept of mobile phone system is the transmission of information carried by some media. In ancient times, people through the post, IP Messenger, flames, etc. for alarm messaging. Today, with the rapid development of science level, have appeared in radio, fixed telephone, mobile phone, Internet, mobile phones and other ways videophone. Mobile phone technology has shortened the distance between people, improve economic efficiency, profoundly changed the way people live and the social landscape. The aim is to deliver phone messages, with different forms of mobile phone accessories recycling business, such as language, text, data, images, symbols, and so on. With the development of society, more and more types of messages recovered Which mobile phone accessories, people passing messages are increasingly high requirements. Transmitting a message the phone is carried by a signal, such as traffic light signals, smoke signals, voltage and current signals, the signal is the carrier of the message. Generally refers to the use of mobile phone technology to recycle electronics and other mobile phone accessories, with electrical (including light signal) from one place to achieve an effective way to deliver the message to another, that exchange and transmission of information. This phone has a fast, accurate, reliable, and almost no time, place, space, distance limitations, which has been the rapid development and wide application. Which mobile phone accessories recycling, recycling south end of mobile phone accessories, electronic Obo Obo provided by Shenzhen Electronic Technology Co., Ltd. Shenzhen Electronic Technology Co., Obo (www.aobodz.com) strong, credible, in other industries, Guangdong Shenzhen accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Obo electronics and you hand into the brilliant, for a better future!