Why do people think they have to answer calls or waste money to find out by buying apps, do you all really care who's calling? If it is truly a legit call and the person needs to speak with you they will leave a message. I never answer my phone unless I recognize the number and want to speak with the person, some times I don't want to be bothered by the person and will let them leave a Vmail and they will leave one if it's important enough. I don't pick up my phone and look at it every time it rings and at night from 7pm to 7am it goes to silent mode. I can see having an app to block unwanted calls, SamSung Galaxy has an setting that will block calls that don't show the number.