Ultra slim mobile phone profiling 9.8 mm least thickness section: “NTT docomo P-05A” is the world’s thinnest clamshell mobile phone. It boasts “One Push Open Button” mechanism allowing easy and assistive unfolding despite its thinness. It also introduces “Relief Key” in pursuit of easy key press and legibility. The usage of special stainless steel material realizes sufficient strength for its thinness. Metallic matted surface realizes both, luxurious visual appearance and touch. In consideration to the information security point of view, the specification of this business exclusive model comes without a mobile camera.