Arduino GSM Data connection for SIM 900 - gsm

Question

I am using SIM 900 GSM module, and I am using this code for GSM based data connection. But problem is I am not getting any feedback from my code. I am from Bangladesh, using a local sim provider's SIM card(Grameen Phone(Telenor)). It's APN is gpinternet/gpwap. But what is the username & password. If the module can connect then it will show some positive feedback otherwise negative. but it showing nothing. Where is my problem? can anyone help me.
#include <GSM.h>
#define PINNUMBER "1234"
// APN data
#define GPRS_APN "gpinternet" // replace your GPRS APN
#define GPRS_LOGIN "" // replace with your GPRS login
#define GPRS_PASSWORD "" // replace with your GPRS password
// initialize the library instance
GPRS gprs;
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSMServer server(80); // port 80 (http default)
// timeout
const unsigned long __TIMEOUT__ = 10 * 100;
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// 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) & (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY)) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}
Serial.println("Connected to GPRS network");
// start server
server.begin();
//Get IP.
IPAddress LocalIP = gprs.getIPAddress();
Serial.println("Server IP address=");
Serial.println(LocalIP);
}
void loop() {
// listen for incoming clients
GSMClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
Serial.println("Receiving request!");
bool sendResponse = false;
while (char c = client.read()) {
if (c == '\n') {
sendResponse = true;
}
}
// if you've gotten to the end of the line (received a newline
// character)
if (sendResponse) {
Serial.println("HI man");
}
}
}
}
}