A system and method for, on a mobile device having a plurality of communication lines on which outgoing calls may be made, providing a user interface for selecting a calling card to be used in making an outgoing call to a desired phone number. The method includes: associating each calling card in a set of at least one calling card with a communication line; and displaying on a display of the mobile device a line selection menu containing a plurality of card/line identifiers; wherein each card/line identifier is configured to uniquely identify a corresponding associated calling card and communication line combination.