Abstract: Transmission of digital data over existing telephone networks is limited by the data bit rate capacity of the telephone lines. This limitation is inherent in the nature of the existing communication lines e.g. copper wires and in the switching circuits that make the connections between telephone subscribers. Digital data may be transmitted over existing telephone lines but due to throughput limitation such transmission is exceedingly slow. A method is provided whereby a digital data file may be transmitted over a plurality of telephone lines simultaneously to increase the throughput and thus greatly increase the speed at which a given digital data file may be transmitted. The method does not require modification nor enhancement to the existing telephone network.