referring to fig1 and 2 , the apparatus of the invention mainly includes a vehicle anti - theft module 1 and a communication module 2 , wherein : a radio receiving unit 11 for receiving radio signals ( such as radio waves , infrared light , bluetooth signals , or the like ) emitted from a wireless remote controller 15 ; a vehicle sensor unit 12 to detect alterations of the vehicle condition ( such as activation of lights in the vehicle , opening of vehicle doors , etc . ), and output a trigger signal to a microprocessor 13 ; a microprocessor 13 to control operations of various units of the anti - theft module 1 , and receive signals from a decoding unit 14 and order other units to respond , and receive anti - theft trigger signals to order an alarm speaker 16 to generate audio alarm or the communication module 2 to transmit signals ; a decoding unit 14 to decode the radio signals of a wireless remote controller 15 and transfer to the microprocessor 13 for processing ; a wireless remote controller 15 emitting remote control signals for setting the activation or closing of the anti - theft module 1 ; an alarm speaker 16 to receive control of the microprocessor 13 and generate audio alarm . a two - way radio transmission / receiving unit 21 to receive and transmit commands transmitted from communication devices outside the vehicle ( such as gsm transmission processor ) to enable users to dial the phone numbers , and to receive and transmit mobile phone signals ; a dtmf detection unit 22 to transform the audio signals ( 1 - 9 , *, #) received by the two - way radio transmission / receiving unit 21 from a mobile phone p to provide a control unit 23 to use ( such as : button key 1 for activating anti - theft , button key 2 for releasing anti - theft , button key 3 for searching vehicle , etc . ); a control unit 23 linking to the anti - theft module 1 for remote control , and control operation of various units of the communication module . it consists of an incoming phone number detection unit 231 for examining data of the incoming phone number , a phone number memory unit 232 for setting phone numbers to activate and close the anti - theft module 1 , and a phone number comparison unit 233 for comparing whether the phone numbers in the phone number memory unit 232 are same as the incoming phone numbers ; a human machine interface 24 serving as an interface between the user and the control unit 23 ( interfaces such as button keys , which may include 0 - 9 , *, #, transmission , cancel , etc ., or led indication lights , wireless dialing , and the like ); and an audio control unit 25 to mute or pause the vehicle stereo system while the two - way radio transmission / receiving unit 21 is operating ( the technique of this portion is known in the art and forms no part of the invention , thus details are omitted ). by means of the construction set forth above , users may use the two - way radio transmission / receiving unit 21 to couple with an earphone / microphone of a handfree handset h and the human machine interface 24 to dial and use the mobile phone . when the vehicle is parked and setting anti - theft is desired , users may use a fixed line or a wireless telephone p to dial the set phone number in the two - way radio transmission / receiving unit 21 . when the call is connected , the incoming phone number detection unit 231 examines the calling phone number and transfers to the phone number comparison unit 233 and the control unit 23 to compare with the phone number stored in the phone number memory unit 232 . if the calling phone number matches the phone number stored in the phone number memory unit 232 , the dtmf detection unit 22 detects the transmitted dtmf code , and decodes the function to be executed , such as activate the anti - theft module 1 , close the anti - theft module 1 , etc . in order to facilitate user selection , the invention may simultaneously enable the wireless remote controller 15 or mobile phone p to activate the anti - theft module 1 in the remote fashion . but to maintain the non - replicatable feature of the invention , a priority sequence may be set for the remote control of the wireless remote controller 15 and the phone p . for instance , if the anti - theft function is activated by the wireless remote controller 15 , then release of the anti - theft function may be achieved through the wireless remote controller 15 and the phone p . if the anti - theft function is activated by the phone , then only the approved phone number is allowed to release the anti - theft function . moreover , the approved phone number may be more than one . thus if one of the phone numbers is lost or ineffective , other phone numbers may be used to release the anti - theft function . moreover , when the anti - theft module 1 is activated and the vehicle door is opened , the microprocessor 13 will be triggered and the alarm speaker 16 will generate alarming sound . meanwhile the microprocessor 13 outputs signals to the communication module 2 , and the control unit 22 orders the two - way radio transmission / receiving unit 21 to dial a preset phone number to notice vehicle owner or designated persons . in addition , it often happens that people forget where the vehicle is located in a large parking lot . in such an occasion , the user may dial the phone number and input a dtmf number ( such as pushbutton key 3 ) for searching the vehicle . once the use depresses the phone key ( such as button key 3 ), the alarm speaker 16 will generate sound in a short interval to enable the user to locate the vehicle . furthermore , in the event of poor communication occurs to the communication module 2 , the priority of releasing the communication module 2 to open vehicle door and anti - theft function may be set automatically . refer to fig3 for another embodiment of the invention . in this embodiment a power supply management unit 17 is added to connect to the microprocessor . when the vehicle is idle for a long period of time or battery voltage is detected too low , a signal may be transmitted to the microprocessor to turn off the communication apparatus , and release the priority of opening vehicle door and anti - theft function in the communication apparatus . in summary , the invention employs incoming phone numbers that cannot be replicated as the means to activate or close the vehicle anti - theft function . it can thoroughly resolve the problems and disadvantages that exist in the conventional anti - theft devices . the embodiments disclosed above only to serve exemplary purpose and should not be deemed as the limitation of the invention . for instance , the wireless remote controller and radio transmission and receiving unit have many other choices in addition to the infrared light transmission unit and bluetooth transmission unit mentioned in the description . modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art . accordingly , the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention .