Abstract: An apparatus is removably attachable to an electronic device associated with wireless communication. The apparatus includes an operational circuitry which includes contact means, memory means and data processing means. The contact means is for electrical coupling between the electronic device and the operational circuitry. The memory means is capable of storing subscriber-identity-module-specific data of at least two subscriber identity module associated with at least one operator of wireless communication for causing the apparatus to act as a plurality of the subscriber identity modules of the at least one operator when in use.

Abstract: An integrated circuit includes a plurality of internal devices that are tested by setting the states of their data registers to respective levels, first forming a known initialization value and then a functional data value. All the data registers used for testing are coupled as one or more shift registers and by clocking data through a serial scan path, test stimuli can be shifted in and results shifted out. The scan path connections are provided in addition to the usual functional operation signal connections. During functional operation, the data transitions in the scan path signals are disabled to reduce the power dissipation associated with driving the scan path signals.