Getting the IMSI number from mobile devices

An International Mobile Subscriber Identity, or IMSI [im-zee], is a unique number associated with all GSM and Universal Mobile Telecommunications System (UMTS) network mobile phone users. It is stored in the Subscriber Identity Module (SIM) inside the phone and is sent by the phone to the network. It is also used to acquire other details of the mobile in the Home Location Register (HLR) or as locally copied in the Visitor Location Register. In order to avoid the subscriber being identified and tracked by eavesdroppers on the radio interface, the IMSI is sent as rarely as possible and a randomly generated TMSI is sent instead.

The IMSI is used in any mobile network that interconnects with other networks, in particular CDMA and EVDO networks as well as GSM nets. This number is provisioned in the phone directly or in the R-UIM card (a CDMA analogue equivalent to a SIM card in GSM)

An IMSI is usually 15 digits long, but can be shorter (for example MTN South Africa's IMSIs are 14 digits). The first 3 digits are the Mobile Country Code, and is followed by the Mobile Network Code (MNC), either 2 digits (European standard) or 3 digits (North American standard). The remaining digits are the mobile subscriber identification number (MSIN) within the network's customer base.

The IMSI conforms to the International Telecommunication Union (ITU) E.212 numbering standard.

Example

IMSI:404400021281732

MCC	404	India
MNC	40	Airtel
MSIN	0021281732

Code:

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class MobileProperties extends MIDlet implements CommandListener {
Form f = null;
Display dis = null;
Command ok = null;
Command exit = null;

public MobileProperties () {
dis=Display.getDisplay(this);
f = new Form(" Mobile Details ");
ok =new Command(" Ok",Command.OK,1);
exit =new Command(" Exit",Command.EXIT,2);
f.addCommand(ok);
f.addCommand(exit);
f.setCommandListener(this);
}

public void startApp(){
try {
f.append(" Nokia IMSI : " + System.getProperty("com.nokia.mid.imsi")+"\n");
f.append(" IMSI : " + System.getProperty("IMSI")+"\n");

} catch(Exception e) {
f.append("Exception :"+e);
}
dis.setCurrent(f);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable s) {
if (c == ok) {
destroyApp(true);
notifyDestroyed();
} else if (c==exit) {
destroyApp(true);
notifyDestroyed();
}
}
}