No matter how often those unknown numbers light up your phone, they're always a nuisance. But that’s not all they are: they can also be deceptive. Case in point: the infamous cars extended warranty scam calls. You know the drill…

According to Pew Research, 8/10 Americans have stopped answering their phones when they get a call from an unknown number. With the ability to identify the caller's number, we can decide whether to answer or not. But what about private…