In recent years, the proliferation in use of the GSM short message service (or SMS) has prompted numerous studies into person to person messaging via mobile devices. However, to date, there has been relatively little exploration of systems that enable mobile messaging to (potentially ubiquitous) situated displays rather than the mobile devices of particular individuals. In this paper, we describe the results of an ongoing trial to explore the utility of a system that enables lecturers in a computing department to use their mobile phones to send messages to digital displays situated outside their offices.