A method creates a banking card that may be a wireless banking card. The banking card has an antenna with an open circuit that prevents the banking card from functioning correctly until it is received by a banking customer the card is to belong to. A cavity is formed within the banking card near the open circuit and a thin wall is created between the cavity and the open circuit. The cavity is filled with a flowable electrical conductor that may be a liquid metal such as mercury or galinstan. Instruction indications are provided on the banking card indicating to a banking customer how to manipulate the banking card to cause the liquid conductor to flow and remove the open circuit and allow the banking card to function correctly.