TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
phoneImei = tm.getDeviceId();
phoneNo = tm.getLine1Number();

import android.app.Activity;
  import android.content.Context;
  import android.os.Bundle;
  import android.telephony.TelephonyManager;
  import android.util.Log;
  import android.widget.Toast;

  public class GetMyPhoneNoActivity extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String number =getMyPhoneNO();
    Toast.makeText(getApplicationContext(), "My Phone No is: "
    +number, Toast.LENGTH_SHORT).show();
    Log.v("Debug", number);
   }

private String getMyPhoneNO(){
    TelephonyManager mTelephonyMgr;
   mTelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

    String yourNumber = mTelephonyMgr.getLine1Number();
 //return yourNumber;
}

<uses-permission android:name="android.permission.READ_PHONE_STATE">
    </uses-permission>

telephonyManager.getSimSerialNumber();

telephonyManager.getNetworkOperator();

telephonyManager.getNetworkCountryIso();

import java.lang.reflect.Method;

 import android.app.NotificationManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.media.AudioManager;
 import android.os.Bundle;
 import android.telephony.TelephonyManager;

 import com.android.internal.telephony.ITelephony;

  public class BlockBlackListIncomingNumber extends BroadcastReceiver {
 private Context cont;
 private Transactions transactions;
 private ITelephony itelephony;;

 int i = 1;


    /* When any incoming calls come to our cellphone number */
@Override
public void onReceive(Context context, Intent intent)
            {
    transactions = new Transactions(context);
                // Create an object of transaction class.
    this.cont = context;
                 // Refer to current object of Context.
    Bundle extras = intent.getExtras();
                 // Getting Bundles in extras.
    String iNumber = extras.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
                 // Getting Incoming Number by which call comes that’s why we used TelephoyManager.EXTRA_INCOMING_NUMBER.

<uses-permission android:name="android.permission.READ_PHONE_STATE" />