How to make Sim548c - GSM part working with arduino

/* SparkFun Cellular Shield - Pass-Through Sample Sketch

SparkFun Electronics Written by Ryan Owens CC by v3.0 3/8/10

Thanks to Ryan Owens and Sparkfun for sketch */

#include <NewSoftSerial.h>  //Include the NewSoftSerial library to send serial commands to the cellular module.
#include <string.h>         //Used for string manipulations
char incoming_char=0;      //Will hold the incoming character from the Serial Port.
NewSoftSerial cell(2,3);  //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx pin.
void setup()
{
  //Initialize serial ports for communication.
  Serial.begin(9600);
  cell.begin(9600);
  Serial.println("Starting SIM548C Communication...");
}
void loop()
{
  //If a character comes in from the cellular module...
  if(cell.available() >0)
  {
    Serial.println("GSM Activated");
    incoming_char=cell.read();    //Get the character from the cellular serial port.
    Serial.print(incoming_char);  //Print the incoming character to the terminal.
  }
  //If a character is coming from the terminal to the Arduino...
  if(Serial.available() >0)
  {
    incoming_char=Serial.read();  //Get the character coming from the terminal
    cell.print(incoming_char);    //Send the character to the cellular module.
  }
}

Starting SIM548C Communication...

GSM Activated
GSM Activated