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C
15 - SIM TOOLKIT
HAPTER
Overview of SIM Application ToolKit
Summary
SIM ToolKit, also known as .SIM Application ToolKit, introduces new functionalities which open the way to a
broad range of value added services. The principle is to allow service providers the ability to develop new
applications (e.g. banking, travel, ticket booking, etc.) for subscribers and to download them into the SIM.
This solution allows new services to be accessible to the user by adding new SIM-based applications without
modifying the handset.
Functionality
SIM Toolkit refers to the functionalities described in the GSM Technical specification 11.14. It introduces
about 25 new commands for the SIM. Three classes of ToolKit functionalities have been defined with
class 1 offering a subset of commands and class 3 offering the full range of commands.
The SIM Application Toolkit supports:
• Profile Download
• Proactive SIM
• Data Download into SIM
• Menu Selection
• Call Control by SIM
Profile Download
The Profile Download instruction is sent by the customer application to the SIM as part of the
initialization. It is used to indicate which SIM Application Toolkit features the customer application
supports.
The AT command used for this operation is +STSF (SIM ToolKit Set Facilities).
Proactive SIM
A proactive SIM provides a mechanism whereby the SIM can ask the customer application to perform
certain actions.
These actions include:
• display menu
• display given text
• get user input
• send a short message
• play the requested tone
• set up a call
• provide location information
This mechanism allows SIM applications to generate powerful menu-driven sequences on the customer
application and to use services available in the network.
The commands used for this operation are:
+STIN (SIM Toolkit Indication)
+STGI (SIM Toolkit Get Information)
+STGR (SIM Toolkit Give Response)
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C
Chapter 15 – SIM TOOLKIT
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