user7680: The code used for interfacing the gsm module with arduino for sending a message is as follows :-
#include <GSM.h>

#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;

// char array of the telephone number to send SMS
// change the number 1-212-555-1212 to a number
// you have access to
char remoteNumber[20]= "12125551212";  

// char array of the message
char txtMsg[200]="Test";

void setup()
{
  // initialize serial communications
  Serial.begin(9600);

  Serial.println("SMS Messages Sender");

  // connection state
  boolean notConnected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while(notConnected)
  {
    if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
  Serial.println("GSM initialized");
  sendSMS();
}

void loop()
{
// nothing to see here
}

void sendSMS(){

  Serial.print("Message to mobile number: ");
  Serial.println(remoteNumber);

  // sms text
  Serial.println("SENDING");
  Serial.println();
  Serial.println("Message:");
  Serial.println(txtMsg);

  // send the message
  sms.beginSMS(remoteNumber);
  sms.print(txtMsg);
  sms.endSMS(); 
  Serial.println("\nCOMPLETE!\n");  
}

the error is found on the 3rd line
    GSM_SMS sms;
as GSM_SMS is not a name type.
what point am i missing here...??
thank you in advance. 

user1357: Update your IDE software. You need IDE 1.0.4 or later. 
I copied your code into my 1.0.5 IDE and compiled it without any error. So it is most probably your version of the Arduino IDE.

7680: <p>The code used for interfacing the gsm module with arduino for sending a message is as follows :-</p>

<pre><code>#include &lt;GSM.h&gt;

#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;

// char array of the telephone number to send SMS
// change the number 1-212-555-1212 to a number
// you have access to
char remoteNumber[20]= "12125551212";  

// char array of the message
char txtMsg[200]="Test";

void setup()
{
  // initialize serial communications
  Serial.begin(9600);

  Serial.println("SMS Messages Sender");

  // connection state
  boolean notConnected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while(notConnected)
  {
    if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
  Serial.println("GSM initialized");
  sendSMS();
}

void loop()
{
// nothing to see here
}

void sendSMS(){

  Serial.print("Message to mobile number: ");
  Serial.println(remoteNumber);

  // sms text
  Serial.println("SENDING");
  Serial.println();
  Serial.println("Message:");
  Serial.println(txtMsg);

  // send the message
  sms.beginSMS(remoteNumber);
  sms.print(txtMsg);
  sms.endSMS(); 
  Serial.println("\nCOMPLETE!\n");  
}
</code></pre>

<p>the error is found on the 3rd line
    GSM_SMS sms;
as GSM_SMS is not a name type.
what point am i missing here...??</p>

<p>thank you in advance. </p>
 1357: <p>Update your IDE software. You need IDE 1.0.4 or later. 
I copied your code into my 1.0.5 IDE and compiled it without any error. So it is most probably your version of the Arduino IDE.</p>
