An occupancy sensing lighting control system is disclosed. The occupancy sensing lighting control system includes an electric lighting fixture configured to illuminate a surrounding area, a wireless communication unit associated with the electric lighting fixture, a signal-generating device, a signal detector, an occupancy condition generating device, and a load control device configured to control the current supplied to the electric lighting fixture. The signal-generating device generates control signals detectable by a mobile cellular phone device which is located within the surrounding area and is not being in an active call mode. The signal detector detects communication signals generated by the mobile cellular phone device and the occupancy condition generating device determines occupancy condition in response to a detection of communication signals from the mobile cellular phone device.