Do you set the phone to silent / vibrate mode? Have you missed an important call because of it? If yes, then "interrupt" is for you. Never miss an important call!
It has intelligence to detect important phone call based on Heuritics. Additionally you can add contacts to VIP list and phone will always ring of you get a call or message from them. You can also block unwanted call using phone numbers - never get disturbed due to unwanted calls. Try it free!
https://play.google.com/store/apps/details?id=com.petalapps.prioritycall
