The subject of the application is a portable communication device having possibility of wired and wireless transmission of audio/video data, characterized in that it is composed of a camera (2) and at least one microphone (3), for the synchronous image capturing, and a speaker (4). These elements (2, 3, 4) are connected to the central unit (5) equipped with cache memory and a microprocessor directly or through the first communication interface (6) to connect to external devices. Moreover, the central unit is connected to a second communication interface (7) for transmission and receiving data through the telecommunication network; all of these items are powered by power source (8). The patent application concerns the method of data transmission which is done by using the device (1) and applications of the device (1), as well as the method.