The balance or a portion of the balance associated with a prepaid card with or without a microcircuit is paid into a balance portion collection server, as a donations to charities, after setting up a call between a terminal and the server and after confirmation of the payment by the user at the terminal to increment a counter with the balance or balance portion. In another embodiment, balance portions are paid cyclically into the server or into a connection unit as and when a telephone call runs.