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 slot formed through an outer surface of the device to receive manually inserted print media to be printed by the printhead; drive means for driving the print media past the printhead during printing; 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.