1. A mobile terminal, comprising: a housing sized and configured to be held in a user's hand; a first user interface located on a first face of the housing and configured to receive a first user input, wherein the first user interface includes a physical or virtual button; a second user interface located on a second face of the housing different from the first face and configured to receive a second user input, the second user interface comprising a touch sensor configured to be used in tandem with the first user interface, wherein the second user interface is positioned on the housing relative to the first user interface to enable one-handed operation of the mobile terminal; and a controller within the housing and coupled to the first and second user interfaces, wherein the controller is configured to detect a combination of the received first and second user inputs and perform a mobile terminal function associated with the detected combination responsive to detecting the combination, and wherein the controller is configured to perform no mobile terminal functions responsive to detecting receipt of the second user input without receipt of the first user input such that the second user interface is not configured to be used without the first user interface, wherein the button includes at least three alphanumeric characters and/or symbols associated therewith, and wherein: the controller is configured to enter a first one of the associated characters and/or symbols responsive to detecting activation of the button on the first user interface as the first user input; the controller is configured to enter a second one of the associated characters and/or symbols responsive to detecting activation of the button on the first user interface as the first user input in combination with detecting a first direction of motion in on the second user interface as the second user input; and the controller is configured to enter a third one of the associated characters and/or symbols responsive to detecting activation of the button on the first user interface as the first user input in combination with detecting a second direction of motion different from the first direction on the second user interface as the second user input.