If your card is missing please lock it in-app. This will prevent anyone from using your Curve but you can unlock it if you find it again.
Tap on the menu at the top left of the app and then select My Curve Card. Then click on the Lock Card button.
To unlock, go to the same place and click Unlock Card.
Choose the menu on the bottom left of the app, then Lock Card.
If you don't have access to the app and have misplaced your card, please call our emergency lost and stolen phone line: +44203 322 2585.
If your Curve is gone forever, message one of the support team in-app or email firstname.lastname@example.org so they can cancel your card and issue a replacement (free of charge).