System for preventing unauthorized use of a mobile phone

A system for preventing unauthorized use of a mobile phone, comprising a portable object having a radio frequency identification component installed therein and said mobile phone installed with a decoding module and an identification data, such that after said mobile phone is turned on, said radio frequency identification component and said mobile phone carry out an authorizing process including:

• enabling signal said decoding module by the mobile phone to send out a radio signal when a phone number is being dialed through the mobile phone;
• enabling said radio frequency identification component to issue an identifying data when said radio frequency identification component is located in an effective region for receiving said radio signal and receives said radio signal;
• enabling said decoding module by said mobile phone to decode said identifying data when said mobile phone receives said identifying data;
• and
• enabling said mobile phone to dial said phone number out and be used normally when said mobile phone determines that said identifying data decoded by said decoding module matches with said identification data installed in said mobile phone,
• wherein said identification data comprises a private system identification code and a radio frequency identification serial number and at least one checking character of said mobile phone, after said identifying data is decrypted by said decoding module, at least a private system identification code, a radio frequency identification serial number and an encrypted data corresponding to said mobile phone are includes, and said encrypted data is decoded by a decoder of said decoding module into at least one checking character, such that after said decoding module completes decrypting said identifying data, said mobile phone carries out the steps of:
• determining whether or not said private system identification code and said radio frequency serial number of said decrypted identifying data are the same as said private system identification code and said radio frequency serial number of said identification data;
• if yes, then decoding said encrypted data into at least one checking character by said decoding module through using said decoder;
• determining whether or not said checking character of said encrypted data after being decoded is the same as said checking character of said identification data;
• and
• if yes, proceeding with normal operating status.