Many cardholders are faced with the question of what to do if the card is stolen or the payment instrument is lost, how to withdraw money from the card without a PIN code? Despite the fact that the fraudster most likely does not know the PIN code of the holder, he can use the card for non-cash payment. One solution is blocking. Many banks have provided that such a situation can occur with any holder, so you can block the card so that it is not used by a fraudster, or until it is found, using a mobile bank. This means that by sending a special code to a specific number, a lock will occur.