Visa is advising its customers to be wary of phone scams in which fraudsters request their credit card information under the guise that they need it for "security reasons" in light of the major data breach that affected Global Payments, according to a Tuesday alert from Visa. The ruse, known as voice phishing, or vishing, is just another example of crooks using fear as a way to cash in on major news events. More than a week ago, Atlanta-based processor Global Payments announced that a segment of its network was breached of some 1.5 million card numbers.