The use of mobile telephones have come into widespread use in such a way that day to day life has become very much dependent on them. This results in unintentional or intentional use of mobile phones in the prohibited areas such as examination centers. A method for detecting active radiofrequency wireless communication signal in a region has been provided. The method involves two stages, calibration stage and mobile phone detection stage. In the calibration stage, the frequency on which the mobile towers in that region are operating are identified. The identified frequency is then used to detect the active wireless RF communication using a plurality of software defined radios (SDR) and the existing client systems present in the region. The method further configured to determine the exact location of the mobile phone from the RF communication signal is generated.