Although it's a very good called ID app, it fails as a simple Dialler app. You can't make a phone call without going through cluttered UI and ads and buy-the-premium pop-ups. One-handed operation in an emergency situation is where this app failed miserably. I had to close the ads and pop-ups before placing an important phone call. Sometimes those few seconds all you'll have to place a call. So choose a simple and efficient Dialler app like the one from Google.