Arduino mega problem

[jot4p]

Hi,

This code:
`
// libraries
#include <GSM.h>

// PIN Number
#define PINNUMBER "2355"

// initialize the library instance
GSM provider; // include a 'true' parameter to enable debugging
GSMScanner scannerNetworks;
GSMModem modem;

// Save data variables
String IMEI = "";

// serial monitor result messages
String errortext = "ERROR";

void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);

while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}

Serial.println("GSM networks scanner");
scannerNetworks.begin();

// 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 (provider.begin(PINNUMBER) == GSM_READY) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}

// get modem parameters
// IMEI, modem unique identifier
Serial.print("Modem IMEI: ");
IMEI = modem.getIMEI();
IMEI.replace("\n", "");
if (IMEI != NULL) {
Serial.println(IMEI);
}
}

void loop() {
// scan for existing networks, displays a list of networks
Serial.println("Scanning available networks. May take some seconds.");
Serial.println(scannerNetworks.readNetworks());

// currently connected carrier
Serial.print("Current carrier: ");
Serial.println(scannerNetworks.getCurrentCarrier());

// returns strength and ber
// signal strength in 0-31 scale. 31 means power > 51dBm
// BER is the Bit Error Rate. 0-7 scale. 99=not detectable
Serial.print("Signal Strength: ");
Serial.print(scannerNetworks.getSignalStrength());
Serial.println(" [0-31]");

}`

return:

GSM networks scanner
Modem IMEI: 0

Current carrier: 0
Signal Strength: [0-31]
Scanning available networks. May take some seconds.

I have a bridge with pin 2 and 10..