Sim Tool Kit Download ( stk.apk )

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.[2] 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.[1] The SIM also gives commands to the handset such as displaying menus and/or asking for user input.[3]
SIM Application Toolkit (commonly referred to as STK) is a standard of the GSM system which enables the Subscriber Identity Module (SIM) to initiate actions which can be used for various value-added services.[1] (source :

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