A telecommunications chip card (100) for enabling the login of a mobile telephone device (202) into a digital cellular mobile telecommunications network (200), the telecommunications chip card comprising: a chip card reader interface (102) adapted for allowing communications between the telecommunications chip card and the mobile telephone device, wherein the chip card reader interface is adapted for receiving physical parameter data (112, 118, 120, 224) via the chip card reader interface; a processor (104); a memory (106) for storing applications for execution by the processor; an application (108) stored in the memory comprising machine readable instructions executable by the processor; and an application management program (110) stored in the memory comprising machine readable instructions executable by the processor, wherein the applications management program enables or disables the application depending on at least the physical parameter data.