This code:
#define PHONE_SIM_SERVICE "com.nokia.phone.SIM"
#define PHONE_SIM_PATH "/com/nokia/phone/SIM"
#define PHONE_SIM_IFACE "Phone.Sim"
#define GET_SERVICE_PROVIDER_NAME "get_service_provider_name"

        DBusGProxy *dbus_g_proxy = NULL;
dbus_g_proxy = dbus_g_proxy_new_for_name(plugin->priv->dbus_conn, PHONE_SIM_SERVICE, PHONE_SIM_PATH, PHONE_SIM_IFACE);
        if(dbus_g_proxy)
        {
                gchar *operator_name = NULL;
                guint32 val1;
                guint32 val2;
                gint32 val3;
if(dbus_g_proxy_call(dbus_g_proxy, GET_SERVICE_PROVIDER_NAME, NULL, G_TYPE_INVALID, G_TYPE_STRING, &operator_name, G_TYPE_UINT, &val1, G_TYPE_UINT, &val2, G_TYPE_INT, &val3))
                {
                        if ((operator_name != 0) && (operator_name[0] != 0))
                        {
                                free(plugin->priv->operator_name);
                                plugin->priv->operator_name = 
strdup(operator_name);
                                g_free(operator_name);                          
                                g_object_unref(dbus_g_proxy);
                                return;
                        }
                }
                g_object_unref(dbus_g_proxy);
        }

should be doing the same as this:
dbus-send --system --type=method_call --print-reply --dest=com.nokia.phone.SIM /com/nokia/phone/SIM Phone.Sim.get_service_provider_name

dbus_g_proxy is initialized to a valid value but the dbus_g_proxy_call call is failing. I can confirm that the dbus-send command outputs valid output on my device, I just cant figure out why my dbus_g_proxy_call call is failing.


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