In case your card gets lost or stolen, all you have to do is call HDFC Bank PhoneBanking immediately and report the loss of your card. This facility is available 24 hrs. on all days. In case if you have been issued a back-up card in the kit, you can activate the back-up card by calling HDFC Bank Phone Banking or through Prepaid NetBanking. Once the back-up card is activated, all the funds from primary card will be transferred automatically to the back up card.