A method, system and graphical user interface (GUI) for a mobile device, the GUI including: (a) at least one multifunctional button having at least two activation states: (i) a first state, when actuated, providing a basic function, and (ii) a second state, when actuated, providing an advanced function; whereby each of the activation states is actuated by a different user action; and (b) a plurality of calling accounts, each of the plurality of calling account being logically associated with a subscriber identity module (SIM) card or a direct inward dial (DID) number; wherein the at least one multifunctional button is configured to facilitate selection of one of the plurality of calling accounts in order to perform a communication event.