A method for controlling secure telemetric payments using an open network. A plurality of servers are utilized: (1) first servers linking merchants with financial institutions, (2) second servers operated by the financial institutions for performing financial transactions for a group of clients with whom consumers perform commercial and financial transactions, and (3) third servers used by service operators for performing validation operations for the transactions. Separate telephone networks are used for connecting the second servers to the third servers, and for linking the third servers to the consumers.