We’ve been hearing reports of an uptick in the scam phone calls that claim to be from Apple. If you answer and an automated message tells you that your iCloud account has been breached and asks you to call a provided 1-866 number. Do not do this!
Apple will never call you unprompted.
Unfortunately, the criminals behind this particular phishing attack are spoofing Apple’s phone numbers effectively so the call looks legitimate. Be very careful about which unrecognized phone calls you answer and if you’re ever asked for personal information like a bank account or credit card number during such a call, hang up, look up the institution’s phone number elsewhere and verify with someone at that number rather than one provided by the caller.