Worry-free card is a bank card housekeeper service launched by some banks at present. It is a 72-hour SMS reminder service for some users. When a user makes a bank card transaction, a short message will be sent in time to remind the cardholder of each transaction, thus reducing or avoiding the possibility that the bank card is swiped by mistake or stolen. The 72-hour card loss guarantee can compensate the cardholder for the economic loss caused by the theft of the credit card under certain circumstances.