Hydraulic fracturing treatments require measurement of numerous parameters, including surface rates and pressures, to quantify fluids, proppant, and additives. Computers are used to acquire data for the purpose of calculating bottomhole pressure (BHP), compiling quality-control data, generating diagnostic plots, and, often, for modeling fracture geometry in real time. In the recent past, modems have been routinely used in conjunction with cellular phone systems to transmit field-monitored data to a remote office. More recently, these data have been used at the remote site to perform 3D fracture modeling for design verification and adjustment. This paper describes data-transmission technology and discusses the related cost and reliability. Remote transmission of data offers a major benefit to operators by providing the ability to monitor treatments and to communicate requests or queries over the phone during the execution of a job. Because reports and pertinent job information are immediately available at the remote location, more sophisticated real-time analyses at a lower cost can be performed. In the past, remote transmission of data had been impractical owing to related cost and technological difficulties. Recent advances in technology, such as the wide availability of cellular phone coverage, however, have made it both cost effective and reliable. Although; the frequency of "noise" and lost connections typically is low, these problems can be handled by implementing an error-correction/recovery scheme, which ensures a continuous flow of information.