个人收集 仅供参考学习 勿做商业用途 原 文 题目：GSM and Application GSM means Global System for Mobile Communications acronym, which is one of the world's leading cellular systems in the world. GSM is based on narrowband TDMA standard that allows radio frequency in a group of 8 call .at the same time. GSM come into being in Europe in 1980s, and put into use in the end of 1997, it has been operated in more than 100 countries, which by 2001, the world's 162 countries have already built about 400 GSM communications network. GSM has become the standard of Europe and Asia in fact. But the GSM system capacity is limited, users in the network overload, it had to construct additional network facilities. What is gratifying is that GSM performance in other areas, which in addition to providing a standardized list and signaling systems, but also opened up some of the more intelligent of the business such as international roaming and so on. The convenience of GSM mobile phone is that it provides a smart card, known as SIM cards, and card could be separated, so that the replacement of mobile phone users and custom per
