When police, fire or ambulance personnel receive an emergency call, they must pinpoint its place of origin in order to respond quickly. When such a call is made from a cellular phone, its place of origin can be determined by using GPS or a cell-based positioning method. However, these methods are sometimes inaccurate and have blind spots. We developed a system for determining location using RFID-reader- equipped cellular phones and RFID tags. We outline the prototype system here