Cellular Shield (Sagem HI-LO) - How to recieve a text?

I've recently purchased a cell shield, the Sagem hi-lo model metioned here http://www.libelium.com/squidbee/index.php?title=New_GPRS_module_for_Arduino_(Hilo_-_Sagem). While I'm able to use the example code on this page for making a call and sending an SMS, I cannot find any program to read a received SMS. Any sample libraries I've downloaded don't seem to work with this model. The aim of my code is to receive an SMS to turn on the cell shield, which will return an SMS with a command, then receive another SMS, read it, and turn on an LED. Any help would be very appreciated.

Thanks, Steve.

The aim of my code is to receive an SMS to turn on the cell shield

If the shield isn't on, is there any reasonable expectation that it will receive a text message?

I am also using a RTC along with this program so I can have the GSM Shield turning on every 10 or 20 mins to check the texts. That shouldn’t be a problem. My problem is getting the GSM Shield to read a text.
To turn on the unit I am using this code

void setup() 
  Serial.println("system startup"); 
  gsm.TurnOn(9600);          //module power on
  gsm.InitParam(PARAM_SET_1);//configure the module  
  gsm.Echo(0);               //enable AT echo 


And in the void loop I have

char inSerial[5];   
  int i=0;
    Check_SMS();  //Check if there is SMS 
void Check_SMS()  //Check if there is an sms 'type_sms'
     char pos_sms_rx;  //Received SMS position     
     if (pos_sms_rx!=0)
       //Read text/number/position of sms
       Serial.print("Received SMS from ");
       Serial.print("(sim position: ");
       if (del_sms==1)  //If 'del_sms' is 1, i delete sms 
         if (error==1)Serial.println("SMS deleted");      
         else Serial.println("SMS not deleted");

This is all taken from an example library. But after sending a text i get this on the serial prompt.

Recieved text from (sim position 65534

. The GSM Shiels knows there is a text there but it isn’t reading or printing it.

Maybe this will be help. http://www.elecrow.com/wiki/index.php?title=GPRS/GSM_Shield_v1.0#Using_Sms_to_Control_an_LED_Status