Leading mobile telecommunications vendors are continually looking at innovative ways to exploit their technology. Sensor networking is an application receiving much attention from these vendors, including Nokia and Siemens. The Commonwealth Scientific and Industrial Research Organisation (CSIRO) has, together with students from the University of Tasmania, developed a mobile telephone sensor network concept demonstrator that enables mobile telephone handsets to harvest observations from Bluetooth-enabled sensor devices. The harvested information is updated to a central database via an Open Geospatial Consortium (OGC) web service interface (Sensor Observation Service (SOS)). This enables the integration of sensors into an OGC Sensor Web and discriminates this from other mobile telephone sensor network applications because it is highly scalable.