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SIM cards are transferable between different mobile devices. The SIM was initially specified by the European Telecommunications Standards Institute in the specification with the number TS 11. This specification describes the physical and logical behaviour of the SIM. 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.
5 billion in revenue for traditional SIM card vendors. 4 by 4 mm silicon chip in a SIM card which has been peeled open. Note the thin gold bonding wires, and the regular, rectangular digital memory areas. Modern SIM cards allow applications to load when the SIM is in use by the subscriber. There is an identical ETSI specification with different numbering. ETSI and 3GPP maintain the SIM specifications. SIM cards store network-specific information used to authenticate and identify subscribers on the network.