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These applications communicate with the handset or a server using SIM Application Toolkit, which was initially specified by 3GPP in TS 11.14.
(There is an identical ETSI specification with different numbering.) ETSI and 3GPP maintain the SIM specifications.
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.
(Refer to GSM 11.11 This is used by network operators to store information on preferred networks, mostly used when the SIM is not in its home network but is roaming.
If a SIM is outside these preferred networks it uses the first or best available network.
Each SIM is internationally identified by its integrated circuit card identifier (ICCID).
SIM cards are always used on GSM phones; for CDMA phones, they are only needed for newer LTE-capable handsets.
SIM cards store network-specific information used to authenticate and identify subscribers on the network.
The most important of these are the ICCID, IMSI, Authentication Key (Ki), Local Area Identity (LAI) and Operator-Specific Emergency Number.
may disrupt the traditional SIM card ecosystem with the entrance of new players specializing in "digital" SIM card provisioning and other value-added services for mobile network operators.
Many non-contractual "pay-as-you-go" arrangements require the subscriber to actively use credit periodically to avoid account expiration, expiration period depends on network operators, typically defining a period from three months to one year.
A SIM card contains its unique serial number (ICCID), international mobile subscriber identity (IMSI) number, security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking code (PUK) for PIN unlocking.