public function displayOverview( $nexmo_response=null ){
		$info = (!$nexmo_response) ? $this->nexmo_response : $nexmo_response;

		if (!$nexmo_response ) return 'Cannot display an overview of this response';

		// How many messages were sent?
		if ( $info->messagecount > 1 ) {
		
			$status = 'Your message was sent in ' . $info->messagecount . ' parts';
		
		} elseif ( $info->messagecount == 1) {
		
			$status = 'Your message was sent';
		
		} else {

			return 'There was an error sending your message';
		}
		
		// Build an array of each message status and ID
		if (!is_array($info->messages)) $info->messages = array();
		$message_status = array();
		foreach ( $info->messages as $message ) {
			$tmp = array('id'=>'', 'status'=>0);

			if ( $message->status != 0) {
				$tmp['status'] = $message->errortext;
			} else {
				$tmp['status'] = 'OK';
				$tmp['id'] = $message->messageid;
			}

			$message_status[] = $tmp;
		}
		
		
		// Build the output
		if (isset($_SERVER['HTTP_HOST'])) {
			// HTML output
			$ret = '<table><tr><td colspan="2">'.$status.'</td></tr>';
			$ret .= '<tr><th>Status</th><th>Message ID</th></tr>';
			foreach ($message_status as $mstat) {
				$ret .= '<tr><td>'.$mstat['status'].'</td><td>'.$mstat['id'].'</td></tr>';
			}
			$ret .= '</table>';

		} else {

			// CLI output
			$ret = "$status:\n";

			// Get the sizes for the table
			$out_sizes = array('id'=>strlen('Message ID'), 'status'=>strlen('Status'));
			foreach ($message_status as $mstat) {
				if ($out_sizes['id'] < strlen($mstat['id'])) {
					$out_sizes['id'] = strlen($mstat['id']);
				}
				if ($out_sizes['status'] < strlen($mstat['status'])) {
					$out_sizes['status'] = strlen($mstat['status']);
				}
			}

			$ret .= '  '.str_pad('Status', $out_sizes['status'], ' ').'   ';
			$ret .= str_pad('Message ID', $out_sizes['id'], ' ')."\n";
			foreach ($message_status as $mstat) {
				$ret .= '  '.str_pad($mstat['status'], $out_sizes['status'], ' ').'   ';
				$ret .= str_pad($mstat['id'], $out_sizes['id'], ' ')."\n";
			}
		}

		return $ret;
	}