The invention relates to a system for encrypting the mobile phone number, and a relative method, wherein the invention is characterized in that: it comprises a phone number encrypt additional device connected to the communication network, database, message center and message gateway; said database is connected to the service control point and service exchange point of intelligent network; said additional device is used to build the relationship between the mobile terminal user number and the public number when registering in the database, and converts the user number into public number as the call treatment. With said system and method, the invention can supply mobile phone number secret service for the mobile phone user, to make the user able to control its phone number; and the broadcasted user number will not reach the phone terminal when the user forbids the application. |