A phone, comprising: a shell and a first communication module, the first communication module for communicating through a first communication network, further comprising: a detection signal acquisition component for acquiring detection signals, a sensor chip for sensing the detection signals and generating a corresponding request signal, and a processing module for receiving a control signal of turning on/off security monitoring function, performing turning on/off security monitoring function based on the control signal, and for receiving the request signal, performing recording and/or notifying security monitoring information based on the trigger of the request signal in the on state of security monitoring, wherein the first communication module, the sensor chip and the processing module are accommodated inside the shell, and the detection signal acquisition component is mounted on the surface of the shell, the processing module is coupled with the first communication module via signals, and characterized in that the processing module is adapted to receive a control signal of turning on/off security monitoring function, wherein the processing module is configured to perform the following steps:: if it is judged that the first communication module receives a normal communication request from a preset caller number, then it is regarded that the processing module receives a control signal of turning off security monitoring function, if it is judged that the first communication module is transferred into standby mode after receiving the communication request, then it is regarded that the processing module receives a control signal of turning on security monitoring function, if it is judged that the first communication module receives a remote monitoring request, then it is regarded that the processing module receives a control signal of turning on/off security monitoring function according to the instruction of the remote monitoring request, wherein the detection signal acquisition component comprises a Fresnel lens, and the sensor chip is a pyroelectric infrared sensor. a detection signal acquisition component for acquiring detection signals, a sensor chip for sensing the detection signals and generating a corresponding request signal, and a processing module for receiving a control signal of turning on/off security monitoring function, performing turning on/off security monitoring function based on the control signal, and for receiving the request signal, performing recording and/or notifying security monitoring information based on the trigger of the request signal in the on state of security monitoring, wherein the first communication module, the sensor chip and the processing module are accommodated inside the shell, and the detection signal acquisition component is mounted on the surface of the shell, the processing module is coupled with the first communication module via signals, and characterized in that the processing module is adapted to receive a control signal of turning on/off security monitoring function, wherein the processing module is configured to perform the following steps:: if it is judged that the first communication module receives a normal communication request from a preset caller number, then it is regarded that the processing module receives a control signal of turning off security monitoring function, if it is judged that the first communication module is transferred into standby mode after receiving the communication request, then it is regarded that the processing module receives a control signal of turning on security monitoring function, if it is judged that the first communication module receives a remote monitoring request, then it is regarded that the processing module receives a control signal of turning on/off security monitoring function according to the instruction of the remote monitoring request, wherein the detection signal acquisition component comprises a Fresnel lens, and the sensor chip is a pyroelectric infrared sensor. if it is judged that the first communication module receives a normal communication request from a preset caller number, then it is regarded that the processing module receives a control signal of turning off security monitoring function, if it is judged that the first communication module is transferred into standby mode after receiving the communication request, then it is regarded that the processing module receives a control signal of turning on security monitoring function, if it is judged that the first communication module receives a remote monitoring request, then it is regarded that the processing module receives a control signal of turning on/off security monitoring function according to the instruction of the remote monitoring request, wherein the detection signal acquisition component comprises a Fresnel lens, and the sensor chip is a pyroelectric infrared sensor.