A mobile device responsive to hand gestures or hand motions detected by a camera. The mobile device comprises: i) transmit path circuitry and receive path circuitry configured to communicate with a wireless network; ii) a memory configured to store a plurality of application programs; iii) a digital camera configured to record an image and to generate a live video stream; and iv) processing circuitry configured to analyze the live video stream and to detect therein a gesture made by a person in the recorded image. In response to detection of the gesture, the processing circuitry performs an operation associated with the detected gesture, such as taking a picture of the image or playing music.