telephonyManager.getCellLocation() returns null android ,why it returns null
<pre><code> TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
 System.out.println("telephonyManager :"+""+telephonyManager);
 GsmCellLocation cellLocation = (GsmCellLocation) telephonyManager.getCellLocation();

 try{
    System.out.println("celllocation :"+""+cellLocation);
    int cid = cellLocation.getCid();
    int  lac = cellLocation.getLac();
    textGsmCellLocation.setText(cellLocation.toString());
} catch(Exception e) {
    e.printStackTrace();
}
</code></pre>
