Communication card for mobile network devices and authentification method for users of mobile network devices

Removable communication card (20) for a mobile network peripheral (101/102), the communication card (20) comprising a network interface module (22) for bidirectional data transmission between the mobile network comprising peripheral (101 / 102) and a network (30), the communication card (20) an identification module (23) for storing identification data of users (40) comprising, and identification data at least data comprising for authentication a user (40) in the network (30), characterized in that the communication card (20) comprises a measuring device (21) for capturing biometric features (401/402) of a user (40), because the communication card (20) comprises an analysis module (24) with a processor unit, being comparable and / or associable, by means of said analysis module (24), the at least one biometric feature (401/402) of the user ( 40) with data stored user identification (40) and in that the identification data further comprise a PIN code which the user (40) is used, via inputs (12) of the peripheral network (101 / 102), to identify during the initial uptake of the at least one biometric feature (401/402).