How to wake up the device

Question

In my alarm Receiver class the device wake up and make phone call.

public void onReceive(Context context, Intent intent) {
     Intent phoneIntent = new Intent(Intent.ACTION_CALL);
     phoneIntent.setData(Uri.parse("tel:07026762692"));
     phoneIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     context.startActivity(phoneIntent);
   ................
   ................

The device does not wake up with my own activiy

    context.startActivity(new Intent(context, NoteActivity.class)
            .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)); 

But, when I press press lock button on device, this activity is showed. How can I do to unlock the device and show my activity.