A mobile phone device configured for overlaying part of a substrate. The substrate contains a printed hyperlink and coded data identifying a plurality of positions on the substrate. The device includes: a mobile telephone transceiver; an optical sensor for reading the coded data; a processor for generating interaction data using the read coded data; a wireless transceiver or memory for retrieval of display data corresponding to the part of the substrate overlain by the device; and a touch-sensitive display screen for displaying information based on the display data. The displayed information includes a displayed hyperlink corresponding to the printed hyperlink. User interaction with the displayed hyperlink via the touch-sensitive display screen causes display of hyperlinked information on the screen.