A method and system for paying for goods or services which includes a mobile radio device and a base telecommunication station which communicates with the mobile radio device via electromagnetic waves. The base telecommunication station transmits the data required for payment to the mobile radio device. The latter asks the user for confirmation for the payment. After the confirmation, the mobile radio device performs a payment operation by transmitting payment instruction data. In addition, either the mobile radio device or a telecommunication device of a financial institution transmits acknowledgment data for the payment operation to the base telecommunication station.