code: public function listInvalidProperties()
      {
          $invalid_properties = array();
  
          if (!is_null($this->container['uri']) && (strlen($this->container['uri']) > 500)) {
              $invalid_properties[] = "invalid value for 'uri', the character length must be smaller than or equal to 500.";
          }
  
          if (!is_null($this->container['number']) && (strlen($this->container['number']) > 120)) {
              $invalid_properties[] = "invalid value for 'number', the character length must be smaller than or equal to 120.";
          }
  
          if (!is_null($this->container['carrier']) && (strlen($this->container['carrier']) > 120)) {
              $invalid_properties[] = "invalid value for 'carrier', the character length must be smaller than or equal to 120.";
          }
  
          return $invalid_properties;
      }
docs: show all the invalid properties with reasons.
  
  @return array invalid properties with reasons