2001年12月，上海西门子移动通信有限公司先后和中国联通五个分公司签署智能网扩容合同，用户容量逾58万，涉及新疆联通、青海联通、江西联通、云南联通和湖南联通，以加大力度开发这些地区预付费业务的潜在用户；至此，西门子为中国联通建设的全国智能网从覆盖21个省市区扩展 December 2001, Shanghai Siemens Mobile Communications Co., Ltd. and China Unicom has five branches signed an intelligent network expansion contract, the user capacity of more than 580,000, involving Xinjiang Unicom, Qinghai Unicom, Jiangxi Unicom, Yunnan Unicom and Hunan Unicom to increase Efforts to develop potential users of prepaid services in these areas; So far, Siemens China Unicom to build a national intelligence network from 21 provinces and cities covering the expansion