One tactic that Pairsys used really stands out: The company would passively seek out targets by putting out fake ads with Microsoft and Facebook logos on them. So Pairsys wasn't just buying up lists of phone numbers, it was investing advertising money to find targets.
Thankfully, the FTC has caught on to their game and is looking to shut them down as you're reading this.
Bonus tip: Avoid these dangerous online shopping scams.
How do you avoid scams like this? There's one very simple thing to consider whenever you receive a phone call or see an advertisement:
Tech support lines are busy. Companies will very rarely start actively calling their customers to see whether or not their computer is infected with a virus. That annoying wait time associated with getting most tech support folks on the line is actually the easiest way to tell whether or not something is a scam.
Other than that, it's always possible to verify phone numbers by visiting Facebook or Microsoft's official support page. You can also check out my top three ways to tell whether or not someone is lying in an email.