To deliver updates, either the SIM must be returned and exchanged for a new one (which can be costly and inconvenient) or the application updates must be delivered over-the-air (OTA) using specialized, optional SIM features. Updating Android software is done over GSM where the SIM Toolkit may install automatically with new software regardless of automatic install applications.Ĭhange in applications and menus stored on the SIM is difficult after the customer takes delivery of the SIM and sometimes may be recognized as surveillance software. STK has been deployed on the largest number of mobile devices.Some manufacturers claim that STK enables higher levels of security through identity verification and encryption, which are necessary for secure electronic commerce.įrom release 4 onwards, GSM 11.14 was replaced by 3GPP TS 31.111 which also includes the specifications of the USIM Application Toolkit for 3/4G networks. In GSM networks, the SIM Application Toolkit is defined by the GSM 11.14 standard released in 2001. Designed as a single application environment, the STK can be started during the initial power up of the SIM card and is especially suited to low level applications with simple user interfaces. STK has been deployed by many mobile operators around the world for many applications, often where a menu-based approach is required, such as Mobile Banking and content browsing. The SIM also gives commands to the handset such as displaying menus and/or asking for user input. This enables the SIM to build up an interactive exchange between a network application and the end user and access, or control access to, the network. The SIM Application Toolkit consists of a set of commands programmed into the SIM which define how the SIM should interact directly with the outside world and initiates commands independently of the handset and the network. A more general name for this class of Java Card-based applications running on UICC cards is the Card Application Toolkit (CAT). Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being an example. SIM Application Toolkit ( STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services.
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