Method 1 (only for Unix):
Run /etc/init.d/sms start to start smsd in background.
Run /etc/init.d/sms stop to stop smsd.
Method 2:
Run /usr/local/bin/smsd -s to start the program and switch on the modem status information. Press Ctrl-C to stop the program.
Run the command sendsms 491721234567 'Hello, how are you' to send a message or put an SMS file into the Outgoing Folder /var/spool/sms/outgoing.
To read a received message, take a look into the Incoming Folder /var/spool/sms/incoming.