The English full name of SIM is "Subscriber IdenTIty Module", which is the "User Identity Module". Its main function is to provide identification information and storage data when the mobile terminal device communicates with the network. It is easy to understand that our telephone number (identification information) is directly bound to the SIM card, and the SIM card is also You can store data such as phone numbers, short messages, and more.
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In the current 3G and 4G mobile systems, the SIM is an application concept. The name of the physical card carrying the SIM application is UICC (Universal Integrated Circuit Card). A UICC card can include multiple logic applications at the same time. For example, a Subscriber Identity Module (SIM), a Universal Subscriber Identity Module (USIM), and other applications (e-wallets, etc.).
USIM is another application on the UICC card. The USIM provides an additional set of parameters different from the SIM for use in WCDMA networks and 4G networks in 3G mobile systems. That is to say, the 2G mobile phone card containing only the SIM application cannot work in the 3G/4G network, which is why we have to go to the operator's business hall to replace the USIM mobile phone card when we want to use the 4G service. The table below lists the main differences between SIM and USIM.
The CDMA terminal originally did not use an external SIM card, and the relevant telephone number identification information was stored in the terminal. This method was generally adopted by North American operators. The TIA-820 standard defined the R-UIM (Removable User Identification Module) in 2000. CDMA terminals that support SIM cards are the most popular in Asia.
After identifying the terms SIM, USIM, and UICC, let's go back and look at some of the knowledge points of the SIM card itself (here, continue to use the SIM card to refer to all mobile phone cards).
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