The use of mobile phones appears to provide a range of opportunities for supporting interaction with public displays. Furthermore, such interaction can help overcome some of the problems associated with interactions with public displays, e.g. the potential inability of users interact with a touch screen display because of its physical placement (e.g. inappropriate height for a wheelchair user), supporting multi-user interaction and as a means for enabling user content to be transferred to a public display. In this paper we discuss our explorations of some of these issues and present design guidelines as a result.