随着移动通信网的发展和移动用户的迅猛增加，用户对移动通信网的服务也提出越来越高的要求。传统的移动电话一般只提供基本通信业务，能满足人们方便、可靠、通信质量好的需求即可。而现在人们越来越多地要求移动电话能完成更多的任务，如：收发电子邮件、Ｉｎｔｅｒｎｅｔ接? With the development of mobile communication network and the rapid increase of mobile subscribers, users are also placing higher and higher demands on the service of mobile communication networks. Traditional mobile phones generally provide only basic communication services, to meet people’s needs for convenient, reliable and good communication quality. Nowadays, people are increasingly asking mobile phones to do more tasks, such as sending and receiving e-mail, connecting with the Internet