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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. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...
[1] [2] The specification was originally part of the GSMA's work on eSIM [3] and it is important to note that remote SIM provisioning is just one of the aspects that this eSIM specification includes. The other aspects being that the SIM is now structured into "domains" that separate the operator profile from the security and application "domains".
After switching on the phone, if the PIN security function is active, the user is required to enter a 4-8 digit PIN to unlock the SIM card and connect to the mobile network. Without this, functions such as phone calls (except for emergency calls), text messages and mobile data will not be available.
The current cellular location of the phone (i.e., which BTS it is at) is entered into the VLR record and will be used during a process called paging when the GSM network wishes to locate the mobile phone. Every SIM card contains a secret key, called the Ki, which is used to provide authentication and encryption services.
If the phone is stolen, it can be tracked by "find my phone" services, while a physical SIM can be removed. [34] The risk of damaging a SIM socket's delicate contacts inserting and removing a SIM is eliminated. Phones with eSIM only do not need to be built with hardware SIM holders or means to insert them.
If the phones were not locked, users might sign a contract with one company, get the discounted phone, then stop paying the monthly bill (thus breaking the contract) and start using the phone on another network or even sell the phone for a profit. [2] SIM locking curbs this by prohibiting change of network (using a new SIM).
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A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).