OK:
1. Using http://talk.maemo.org/showpost.php?p...5&postcount=20 as inspiration, I see how to send a number of AT commands one by one to pnatd via python.
2. The references http://www.control.com.sg/at_commands_sms.aspx http://www.smssolutions.net/tutorials/gsm/sendsmsat/ and http://www.activexperts.com/xmstoolk...ommands/nokia/ show the necessary AT commands for SMS sending.

As I'm not familiar with python, can someone help me with the following:

To send the SMS number and text, you need to input AT+CMGS="+yyyyy", hit Enter then enter the message text and hit Ctrl-Z, maybe twice. How do I modify the above python code to send Ctrl-z?