/**
  * 
  * Count the number of associated items for a simcard item
  * 
  * @param $item   Simcard object
  **/
 static function countForSimcard(PluginSimcardSimcard $item)
 {
     $restrict = "`glpi_plugin_simcard_simcards_items`.`plugin_simcard_simcards_id` = '" . $item->getField('id') . "'";
     return countElementsInTable(array('glpi_plugin_simcard_simcards_items'), $restrict);
 }