Mobile one-machine multiple numbers service system and its application

The invention comprises: host VLR; tandem MSC/IVR; service processing server and accounting server. It registers and saves the mapping numbers relating to the real number of a user subscribing SSMN (single SIM multi number) service into the host MSC/VLR platform; the registered mapping number is always on line and is controlled by the platform; when the mobile network initiates a call to the mapping number, all services relating to the mapping number will be transferred to the service platform; the user of mobile phone uses the transferred services to selectively answer the call or receive the short message. The invention can be used in GSM network or CDMA network.