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It is true that some credit card issuers offer unlimited virtual card numbers (also called virtual credit cards) for online purchases. Virtual card numbers are temporary and can be generated for one-time use or specific merchants, providing an added layer of security. However, not all banks provide this feature, and the availability of virtual cards varies by issuer and card type. Some services, like Capital One's Eno or Citi's Virtual Account Numbers, are examples of banks offering virtual cards for online shopping.