bearerType returns 0 in WinCE7 device

#include <QtCore/QCoreApplication>
#include <QNetworkConfigurationManager>
#include <cstdio>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QNetworkConfigurationManager manager;

    printf("Starting server\n");
    QNetworkConfiguration config;
    QList<QNetworkConfiguration> nlist = manager.allConfigurations(0);
    printf("count:%d\n", nlist.count());

    for (int i= 0; i < nlist.count(); i++)
    {
        config = nlist[i];
        QString trial = config.bearerTypeName();
        printf("configuration is %s\n",trial.toAscii().constData());
        printf("bearertype is %d\n",config.bearerType());
        printf("state is %d\n",config.state());
        printf("-----------------\n");
    }
    return a.exec();
}