A nonvolatile semiconductor memory device and a writing method thereof are provided. In order to carry out said operations with the aid of extremely simple extrusion devices and moulds, thc extruded preform is expanded to a given size and a core is moved upwards into the expanded preform. The sensing management module transmits an SIP registration message to an SIP proxy server and notifies the terminals of the completion of SIP registration. The switch may be used to select one of a plurality of capacitances, affecting the tonality of the sound. The device is secured against the lens capsule using suction applied by one or more suction elements. The novel storage enables the subscriber to access hisher subscribed services from another location, or even after the subscriber has reconfigured the original location.