The invention relates to a method and a simulator (1) for identifying and/or tapping a mobile terminal (7) in a digital cellular mobile radio network, in which data is transmitted according to a code multiplex method. The aim of the invention is to enable a terminal (7) to be identified in a mobile radio network, in which data is transmitted according to a code multiplex method and if required to enable the tapping of conversations that are conducted via the mobile telephone. To achieve this: a simulator (1) is positioned in close proximity to the terminal (7) to be identified; the parameters that are relevant to the data transmission of base stations (6) in the mobile radio network that are in close proximity to the simulator (1) are determined by a measuring system (3; 11) and are transferred to the simulator (1); the simulator (1) is operated as a new base station (2), taking into consideration the determined parameters, but having another location area code; the terminal to be identified (7) recognizes the simulator (1) as a new base station (2) and logs on to said station using its identification parameters; the terminal (7) is identified by means of the transmitted identification parameters; after identification, the terminal (7) is redirected to a GSM mobile radio network.