A system for time deferred usage of mobile data by a plurality of user devices each coupled to a network server and running one or more applications. The system includes a network measurement module, user profiling module and a price-optimization computational module located at the network server and a user interface module located at each user device. The network measurement module collects traffic data from each of the applications to generate the historical congestion data and current congestion data. The user profiling module is configured to receive user reaction data and determine how much mobile data for each application may be deferred to a later point in time to generate the predicted user reaction data. The price-optimization receives the historical congestion data and the current network congestion data from the network measurement module and the predicted user reaction data from the user profiling module and generate day-ahead time-dependent price data for a plurality of upcoming timeslots of mobile data based on the historical congestion data, current network congestion, predicted user reaction data, network operator costs for data exceeding maximum network capacity and network operator costs for supplying data in less-congested time periods. The user interface receives a time interval based delay selection input for each of the one or more applications, select one or more of the upcoming data timeslots of mobile data for use by the one or more applications and delay mobile data usage by each of the one or more applications based on the delay selection input.