\"TD-SCDMA Standard and Test\" Technical Training -- USIM-ME Interface Technology: UICC/USIM Introduction PLMN Selection Phone Book Authentication Process in USIM SIM/USIM Interoperation USAT Introduction SIM, USIM and UICC SIM (Subscriber Identity Module) GSM-defined smart card (ICC), which was originally defined as a physical and logical entity, does not distinguish between platforms and applications, and SIM can only accept 2G commands. USIM (Universal Subscriber Identity Module) A purely logical application residing on the UICC to access the UMTS network. USIM can provide 2G authentication and key negotiation mechanisms to enable 3G terminals to access the 2G network. UICC (Universal Integrated Circuit Card) A removable hardware module that can be considered a removable multi-application IC card. The physical and logical platform of USIM. It contains at least one USIM application, and can also contain SIM applications. In addition, it can also contain other applications (such as mobile banking and mobile commerce).
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