PositionSource doesn't work on Symbian in China

import Qt 4.7
import QtMobility.location 1.2

Rectangle {
        id: page
        width: 360
        height: 640
        property bool sp: true
        PositionSource {
            id: positionSource
            updateInterval: 1000
            active: false
        }
        Column {
            Text {text: "<==== PositionSource ====>"}
            Text {text: "positioningMethod: "  + printableMethod(positionSource.positioningMethod)}
            Text {text: "nmeaSource: "         + positionSource.nmeaSource}
            Text {text: "updateInterval: "     + positionSource.updateInterval}
            Text {text: "active: "     + positionSource.active}
            Text {text: "<==== Position ====>"}
            Text {text: "latitude: "   + positionSource.position.coordinate.latitude}
            Text {text: "longitude: "   + positionSource.position.coordinate.longitude}
            Text {text: "altitude: "   + positionSource.position.coordinate.altitude}
            Text {text: "speed: " + positionSource.position.speed}
            Text {text: "timestamp: "  + positionSource.position.timestamp}
            Text {text: "altitudeValid: "  + positionSource.position.altitudeValid}
            Text {text: "longitudeValid: "  + positionSource.position.longitudeValid}
            Text {text: "latitudeValid: "  + positionSource.position.latitudeValid}
            Text {text: "speedValid: "     + positionSource.position.speedValid}
            Rectangle {
                width: 100
                height: 50
                color: sp? "red":"blue"
                MouseArea {
                    anchors.fill: parent
                    onClicked: {
                        if(sp){
                            positionSource.start()
                            sp=false
                        }else {
                            positionSource.stop()
                            sp=true
                        }
                    }
                }
            }
        }
        function printableMethod(method) {
            if (method == PositionSource.SatellitePositioningMethod)
                return "Satellite";
            else if (method == PositionSource.NoPositioningMethod)
                return "Not available"
            else if (method == PositionSource.NonSatellitePositioningMethod)
                return "Non-satellite"
            else if (method == PositionSource.AllPositioningMethods)
                return "All/multiple"
            return "source error";
        }
    }