arduino with sim900 problem

Projects Networking, Protocols, and Devices
1

hello friends

i am trying to read the sms using sim900 through arduino duemilanove(atmega 328)
so i am using GSM shield library and i found the following code
i am trying to read the sms but i am unable to do so
i tried to understand the code so i found that it is going into the loop but this code is unable to go in this function i think
if(gsm.readSMS(smsbuffer, 160, n, 20))

can anybody help me in this????

any help is eagrly appreciated

#include "SIM900.h"
#include <SoftwareSerial.h>



#include "sms.h"
SMSGSM sms;



//Simple sketch to send and receive SMS.

int numdata;
boolean started=false;
char smsbuffer[160];
char n[20];

void setup() 
{
  //Serial connection.
  Serial.begin(9600);
  Serial.println("GSM Shield testing.");
  //Start configuration of shield with baudrate.
  //For http uses is raccomanded to use 4800 or slower.
  if (gsm.begin(2400)){
    Serial.println("\nstatus=READY");
    started=true;  
  }
  else Serial.println("\nstatus=IDLE");
  
  if(started){
   
  }

};

void loop() 
{
  if(started){
    //Read if there are messages on SIM card and print them.
    if(gsm.readSMS(smsbuffer, 160, n, 20))
    {
      Serial.println(n);
      Serial.println(smsbuffer);
    }
    delay(1000);
  }
};