Abstract: The present disclosure is directed to a system and method for wirelessly executing transactions with different institutions. In some implementations, a physical interface, a communication module, secure memory, a user-interface module, and a transaction module. The physical interface connects to a port of a mobile host device that includes a Graphical User Interface (GUI). The communication module wirelessly receives Radio Frequency (RF) signals from and transmits RF signals to an access terminal. The secure memory stores a plurality of selectable user credentials. At least one set of user credentials is used to execute transactions with the access terminal, and each set is associated with different institutions.

Abstract: The present disclosure is directed to a system and method for interfacing transaction cards with mobile devices. In some implementations, a method includes identifying the mobile host device in response to at least insertion of at least a portion of the card into a port of the mobile host device. The mobile host device includes a Graphical User Interface (GUI). The card wirelessly executes financial transactions with a retail terminal independent of the mobile host device and presents and receives information through the GUI of the mobile host device. One or more commands are transmitted to the mobile host device in response to at least an event. The card substantially controls one or more hardware elements of the mobile host device using the one or more commands.