A liquid crystal display device and a mobile telecommunication terminal using the same can display messages such as information on a calling party, a received message, and temporal information even when a folding cover is not open by using a double-faced liquid crystal display device. The double-faced liquid crystal display device includes a first substrate having a common electrode, a second substrate having n scan electrodes and m signal electrodes, a liquid crystal layer disposed between the first and second substrates, a polarizer, and a reflector, wherein the liquid crystal display device is divided into a first region and a second region, and the polarizer and the reflector are symmetrically disposed so that the first region is displayed in a first direction and the second region is displayed in a second direction.