a handheld mobile communications device comprising : a support structure ; an antenna mounted on the support structure for transmitting and receiving radio signals ; radio signal processing circuitry positioned on the support structure to process the radio signals ; a speaker and microphone arrangement positioned on the support structure and operatively connected to the radio signal processing circuitry ; a printhead positioned on the support structure to carry out a printing operation ; a capping mechanism configured to selectively cap the printhead when the printhead is not in use ; and printing processing circuitry positioned on the support structure , the printing processing circuitry being configured to : generate dot data ; supply the dot data to the printhead ; and control operation of the printhead .