You can visit our website. Login into your MoneyPolo account. Select the “Prepaid Card” bookmark and on the left side Menu select a button “Lock/Unlock a Card” and follow displayed steps. If you want to lock a card via phone line you can call our customer support team on UK 44 (0) 203 397 0726, who can place a temporary block on your card. If card is really lost/stolen at the same web page you can order a card replacement for you. All funds on the cancelled card will be moved directly to your new card on activation.