To freeze an Apple Card, log in to the Apple Wallet app and navigate to “Lock Card.” You can also call Apple customer service at 1 (877) 255-5923 and ask them to freeze your card, though it is much easier to lock and unlock a credit card on the app.
Freezing your Apple Card will temporarily prevent purchases from being made with your card number, which can be convenient if you lost your credit card or if you're trying to control your spending. For lost cards, it's also important to note that you won't be held responsible for unauthorized purchases thanks to a $0 fraud liability guarantee.
How to Freeze an Apple Card
Log in to the Apple Wallet app.
Select the Apple Card and then choose the ellipsis button.
Click Physical Card.
Change the settings so that your card is in the locked position.
Locking your Apple Card will stop new purchases. To start using your credit card at full capacity again, just navigate back to the Lock Card page and unlocked the Apple Card.