Smart SIM is an advanced version of the subscriber identification module (SIM). SIM is an integrated circuit used for managing the international mobile subscriber identity (IMSI) number and the key related to this number. SIM is used to authenticate and identify subscribers on mobile devices. Smart SIM cards are primarily used with global system for mobiles (GSM) phones. Code division multiple access (CDMA) phones use smart SIM cards for the new long-term evolution (LTE) service. Demand for smart SIM cards has increased tremendously, due to the growing adoption of smart phones worldwide. Smart SIM provides increased storage space, which also increases the size of phone book. With 64 KB of storage space, customers are able to store more phone numbers in their smart SIM cards. These cards can be used with all mobile phones that support the SIM toolkit technology. Using smart SIM cards, customers can easily activate the international calling functionality. Some smart SIM cards are avail...