Abstract: The paper considers some aspects of use of the Universal Forensic Extraction Device (UFED) in investigation and expert practices. The author describes the essence of this device and its technical capabilities, and explains the necessity to use it by agencies of preliminary investigation. Moreover, the author raises the issues of procedural registration of the results of the collection of data about subscribers and (or) subscriber devices using UFED, and offers the ways to solve them. The author applies the set of general scientific and special research methods including the normative-logical method, the system method, analysis, synthesis, deduction, induction and others. The novelty of the research consists in the fact that nowadays, due to the increase of the number of mobile devices and registered subscribers, including criminals, the information, transmitted via mobile devices, should be controlled. The analysis and processing of the information about connections between subscribers and (or) devices is one of the promising directions of the forensic ensuring of criminal investigations. 

Keywords: investigator, judicial information, data about subscribers, subscriber device, cellular telephone, complex, procedural registration, forensic technique, identification, data extraction