Sending SMS through serial port (RS-232) with your GSM Modem/Phone

My goal now is to be able to send sms using a gsm modem through serial port.
The following hardware setup has been used:
Debian sarge kernel 2.6
WaveCom M1306B GSM/GPRS-Modem Fastrack Modem

Using minicom, you can try the following to test the modem
AT
OK
AT+CMGF=1
OK
AT+CMGW="+639221234567"
> A simple demo of SMS text messaging.
> CTRL-Z
+CMGW: 1

OK
AT+CMSS=1
+CMSS: 20

OK

Line by line explanation:

Line 1: "AT" is sent to the GSM / GPRS modem to test the connection. The GSM / GPRS modem sends back the result code "OK" (line 2), which means the connection between the HyperTerminal program and the GSM / GPRS modem works fine.


Line 3: The AT command +CMGF is used to instruct the GSM / GPRS modem to operate in SMS text mode. The result code "OK" is returned (line 4), which indicates the command line "AT+CMGF=1" has been executed successfully. If the result code "ERROR" is returned, it is likely that the GSM / GPRS modem does not support the SMS text mode. To confirm, type "AT+CMGF=?" in the HyperTerminal program. If the response is "+CMGF: (0,1)" (0=PDU mode and 1=text mode), then SMS text mode is supported. If the response is "+CMGF: (0)", then SMS text mode is not supported.


Line 5 and 6: The AT command +CMGW is used to write an SMS text message to the message storage of the GSM / GPRS modem. "+639221234567" is the recipient mobile phone number. After typing the recipient mobile phone number, you should press the Enter button of the keyboard. The GSM / GPRS modem will then return a prompt "> " and you can start typing the SMS text message "A simple demo of SMS text messaging.". When finished, press Ctrl+z of the keyboard.


Line 7: "+CMGW: 1" tells us that the index assigned to the SMS text message is 1. It indicates the location of the SMS text message in the message storage.


Line 9: The result code "OK" indicates the execution of the AT command +CMGW is successful.


Line 10: The AT command +CMSS is used to send the SMS text message from the message storage of the GSM / GPRS modem. "1" is the index of the SMS text message obtained from line 7.


Line 11: "+CMSS: 20" tells us that the reference number assigned to the SMS text message is 20.


Line 13: The result code "OK" indicates the execution of the AT command +CMSS is successful



Got this from:
http://www.developershome.com/sms/howToSendSMSFromPC.asp