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移动通信以其灵活、便捷的特点符合现代社会人们对通信的要求，成为20世纪80年代中期以来发展最为迅速的通信方式，它经历了从模拟调制技术到数字调制技术的发展过程。现在我国已经出现了5种移动电话网共存的局面，它们是A、B、C、D、G网。这5种网各有不同的通话范围和业务功能
Mobile communication has become the fastest-growing communication mode since the mid-1980s because of its flexibility and convenience. It has undergone a development from analog modulation to digital modulation. Now China has emerged five kinds of mobile phone network coexistence situation, they are A, B, C, D, G network. These five kinds of networks have different calling ranges and business functions