A method is provided for expanding the input and output capabilities of a mobile communications device. If a received signal should be immediately outputted, then a user of the mobile communications device selects an open interface output port for the received signal prior to receiving the signal. Upon reception, the received signal may be transmitted via the open-interface output port on the mobile communications device to an external device. If the received signal may be outputted at another time, then the user of the mobile communications device selects the open interface output port before or after receiving the signal. Upon reception, the signal may be stored as one or more files on the mobile communications device. At another time, the user may use the mobile communications device to transmit, via the open interface output port, a second signal having the one or more files to the external device.