This actually isn’t a particularly new scam, but it appears to be increasing in frequency enough that Apple has actually warned iPhone users not to answer Apple support calls unless they specifically requested one from the company’s support page.
If you do answer, the person on the other end will let you know that they are from Apple and are calling to let you know your account has been compromised. They’ll then let you know they want to help you secure your account by verifying your information.
The whole thing is a phishing scam.
The majority of us are smart and savvy enough to not fall for this but please remind family and friends Apple will NEVER call you out of the blue and they should NEVER answer or respond to any calls, texts or emails purporting to be from Apple if they haven’t specifically requested.