A light-emitting device includes a rectangular substrate, a through-holes that is in a shape of a quarter of circle provided in two corners or four corners of the substrate, a pair of electrodes provided along short sides of the substrate and electrically connected to the through-hole that is adjacently disposed to each of the electrodes. A display region has a plurality of picture elements. A semantic cue is provided during the telephone call, wherein the semantic cue is indicative of the current driving situation and wherein the semantic cue is audible at least for a caller calling the driver. In response to the information, the virtual operator controls an input device to automatically execute predetermined operations on the client computer system via the input interface. Signaling may be transported either over a non-cellular access network or, using dual-mode terminals, over the cellular RAN.