An "instant approval" credit card is not the same as an "instant use" credit card.
An instant approval credit card is a type of credit card application that can tell you in minutes if you've been approved or denied for a new credit card. For example, you can apply for a Discover® Card and get a decision in as little as 90 seconds.1
An instant use credit card is a credit card that lets a cardholder use their new account as soon as they get approved, so they don't have to wait to receive a physical card in the mail to start spending. This instant use is made possible with a virtual card number that the customer can enter online.