You recognize it the moment you pick up the phone. The quiet beat before a clearly prerecorded message speaks ominously about your Social Security number getting canceled. Or perhaps it's a call trying to sell you health insurance or a vacation. Either way, you've been hit by a robocall, and you're not alone. YouMail , which makes robocall-blocking software, estimates that Americans received 47.8 billion robocalls in 2018. The FCC says that US consumers receive 350,000 unwanted calls every three minutes, and of those calls, a whopping 47 percent are illegal scams. Unwanted robocalls aren't just an annoyance; they can also take advantage of the vulnerable, leading to serious loss of funds.