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Many non-contractual "pay-as-you-go" arrangements require you to actively use credit periodically to avoid account expiration, expiration period depends on network operators, typically defining a three months period.
The SIM also stores other carrier-specific data such as the SMSC (Short Message Service Center) number, Service Provider Name (SPN), Service Dialing Numbers (SDN), Advice-Of-Charge parameters and Value Added Service (VAS) applications.
Each SIM is internationally identified by its integrated circuit card identifier (ICCID).
ICCIDs are stored in the SIM cards and are also engraved or printed on the SIM card body during a process called personalisation.
The first SIM card was developed in 1991 by Munich smart-card maker Giesecke & Devrient, who sold the first 300 SIM cards to the Finnish wireless network operator Radiolinja.
Today, SIM cards are ubiquitous, allowing over 7 billion devices to connect to cellular networks around the world.
The SIM was initially specified by the European Telecommunications Standards Institute in the specification with the number TS 11.11.