Teach you how to correctly distinguish between SIM card, USIM card, UICC card, eSIM card

The full English name of a SIM card is "Subscriber Identity Module," often referred to as the "User Identity Module." Its primary role is to provide identification information and store data when a mobile device connects to a network. In simpler terms, your phone number (as identification) is directly linked to the SIM card, which also allows storage of additional data such as contact numbers, text messages, and more.

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In modern 3G and 4G mobile systems, the term "SIM" refers to an application concept. The physical card that carries this application is called a UICC (Universal Integrated Circuit Card). A single UICC card can host multiple logical applications simultaneously, such as the Subscriber Identity Module (SIM), the Universal Subscriber Identity Module (USIM), or even other services like e-wallets. USIM is another application found on the UICC card. It provides a separate set of parameters specifically for use in WCDMA and 4G networks within the 3G system. This means that a 2G SIM card, which only contains the SIM application, cannot function in 3G or 4G networks. That’s why many users had to visit their service provider’s office to switch to a USIM card when upgrading to 4G. Below is a table showing the main differences between SIM and USIM cards. Originally, CDMA devices did not use an external SIM card. Instead, the phone number and related identification information were stored directly in the device. This approach was commonly used by North American operators. In 2000, the TIA-820 standard introduced the R-UIM (Removable User Identification Module) to support SIM-like functionality in CDMA networks. Today, CDMA terminals that support SIM cards are more popular in Asia. After understanding the distinctions between SIM, USIM, and UICC, let's take a closer look at the SIM card itself. For simplicity, we'll continue using the term "SIM card" to refer to all types of mobile phone cards.

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