public function historyGprsAction()
 {
     $sim = $this->getSim();
     $this->_helper->allowed('historyGprs', $sim);
     $from = $this->_getParam('from');
     $until = $this->_getParam('until');
     $data = $this->_simSrv->historyGprs($sim, $from, $until);
     foreach ($data as $entry) {
         $this->_helper->filterNotAllowedFields('historyGprs_read_column', $sim, $entry);
     }
     $this->view->data = $data;
 }