Such backward and forward compatibility is achieved by the carefully designed offloading of some computations and storage to mobile phones. These Rel 99+ USIMs can be used to access every generation of mobile networks, including 5G. In this post, we refer to these newer smart cards as Rel 99+ USIM which are compatible with 3GPP Release 1999 (first 3G specifications) and afterwards. Learn how 5G security enables a trustworthy system in our 5G security whitepaper. The universal subscriber identity module ( USIM) is one of several software applications that resides in the hardware part, called the universal integrated circuit card ( UICC). Even though these SIMs can also be used in 3G systems, for enhanced security, 3G systems use a newer smart card with software and hardware separated. In 2G, the smart card is called the subscriber identity module ( SIM) that represents hardware and software together. By "SIM cards", we mean those smart cards that are used in mobile networks. To understand the context behind this question, let’s briefly discuss different types of SIM cards. This post was originally published in January 2020 and updated in August 2021 to reflect new developments in standardization.
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