[Grml] dialup problems

How do I establish a dialup connection in grml 0.3? I config'ed wvdial and tried to start it but but I get "/dev/ttyS0 not recognized". My modem works on other linux partitions and is on ttyS0. It is in the directory in grml under /etc/dev. Thanks for the help. Let me know if you need more details. Jeff