code: func (s *ScheduledEvent) Send(c *sms.Conn) error {
  	switch s.FlexIDType {
  	case FIDTPhone:
  		if err := c.Send(s.FlexID, s.Content); err != nil {
  			return err
  		}
  	default:
  		return fmt.Errorf("unrecognized flexidtype: %d", s.FlexIDType)
  	}
  	return nil
  }
docs: // Send a scheduled event. Currently only phones are supported.