Abstract: A method for loading or reloading a SIM card (7) for a mobile device (6). The SIM card (7) has an electronic chip with a storage device (11). In the storage device (11) a monetary sum (28) is stored, and decreases as the mobile telephone is used. For loading or reloading the monetary sum, a prepayable value card (13) is purchased. The value card (13) has a code field (14) covered by a removable opaque layer (22). Upon removal of the layer (22), a code (15) becomes visible. The holder of the SIM card and the value card calls a service number using a communication apparatus (6, 8). The caller is thereby connected to a data base (17) in which all codes assigned to value cards (13) and the sum of money associated with each code are stored. The caller is prompted to enter the code (15) on the calling communication apparatus. The code (15) entered is compared with the codes stored in the data base (6, 8).