Setting smsd's effective group to 'smsd' (in /etc/default/smstools) seems to me the better option. That way users can be given access to the smstools spool directories (by adding them to group 'smsd') without granting them access to the "raw" modems (which would happen if they were added to 'dialout').
Setting smsd's effective group to 'smsd' (in /etc/default/ smstools) seems to me the better option. That way users can be given access to the smstools spool directories (by adding them to group 'smsd') without granting them access to the "raw" modems (which would happen if they were added to 'dialout').