Make use of PhoneManager.handlePinMmi() in dialer.

import android.app.KeyguardManager;

import android.app.ProgressDialog;

import android.content.ActivityNotFoundException;

import android.content.ComponentName;

import android.content.ContentResolver;

import android.content.Context;

import android.content.DialogInterface;

import android.database.Cursor;

import android.net.Uri;

import android.os.Looper;

import android.os.RemoteException;

import android.os.ServiceManager;

import android.phone.PhoneManager;

import android.provider.Settings;

import android.telephony.PhoneNumberUtils;

import android.telephony.TelephonyManager;

import android.widget.Toast;

import com.android.contacts.common.database.NoNullCursorAsyncQueryHandler;

import com.android.internal.telephony.ITelephony;

/**

 * Helper class to listen for some magic character sequences

    static boolean handlePinEntry(Context context, String input) {

        if ((input.startsWith("**04") || input.startsWith("**05")) && input.endsWith("#")) {

            try {

                return ITelephony.Stub.asInterface(ServiceManager.getService("phone"))

                        .handlePinMmi(input);

            } catch (RemoteException e) {

                Log.e(TAG, "Failed to handlePinMmi due to remote exception");

                return false;

            }

            PhoneManager phoneManager =

                    (PhoneManager) context.getSystemService(Context.PHONE_SERVICE);

            return phoneManager.handlePinMmi(input);

        }

        return false;

    }