A smart card, chip card, or integrated circuit card (ICC), is any pocket sized card with embedded integrated circuits. Smart cards can provide identification, authentication, data storage and processing applications. Mobile cellular devices enable people to communicate wirelessly. Users can switch from one other mobile device while retaining their customer information by using the SIM (Subscriber Identity Module) card technology. SIM card and memory storing customer information, for example for personal directory SIM number that uniquely identifies the customer through the International Mobile Subscriber Identity (IMSI). Those first 3 digits represent the Mobile Country Code (MCC). These next 2 digits represent the Mobile Network Code (MNC). The following is a 10 digit mobile station identification number.

SIM card technology is very sophisticated, if the SIM card to verify the customer, it received IMSI number as the phone will activate and send the number to mobile operators to request access. The operator searches the database for the IMSI numbers and creates RAND, or Random Number, which is associated with the IMSI. Then compare the customer identification number stored in the network to the SIM IMSI. If the license number matched the note, the service allows subscribers access to the network. SIM card used to authenticate a customer. SIM card that allows customers to turn their phones on the network and still receive the same service by removing the SIM card in the phone and transfer to another phone.

SIM cards (Subscriber Identity Module) is a stamp sized smart card that is placed on a mobile phone that stores the identifier key telecommunications services. The SIM card must be used in GSM systems. Similar to the SIM card in UMTS is called a USIM, RUIM (Removable User Identity Module) cards, while popular in CDMA systems. SIM card reader is a smart tool that can detect your SIM card. It can manage your phone book and back up all your telephone book if one time the damage occurred on your SIM card or you lost your mobile phone.

With this SIM card reader you can quickly upgrade, copy, or move data without having to manually type the SIM card to another and doesn’t change the contents information from the old SIM card. SIM card reader is also safe on your personal computer. When you're detecting your SIM card, is equipped with sophisticated equipment safe application for your personal computer. So you do not need to worry if it turns out your SIM card is damaged, but will have no effect on your personal computer.