Chapter 15 – SIM TOOLKIT
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 112
Data Download to SIM
Data downloading to the SIM allows data (SMS, phonebook) or programs (Java applets) received by
SMS or by Cell Broadcast to be transferred directly to the SIM Application.
This feature does not need any AT command. It is transparent to the customer application.
Menu Selection
A set of menu items is supplied by the SIM Application ToolKit. The menu selection command can then
be used to inform the SIM Application which menu item is selected.
The commands used for this operation are:
+STIN (SIM Toolkit Indication)
+STGI (SIM Toolkit Get Information)
+STGR (SIM Toolkit Give Response)
Call control by SIM
The call control mechanism allows the SIM to check all dialed numbers, supplementary service control
strings and USSD strings before connecting to the network. This gives the SIM the ability to allow, bar or
modify the string before the operation starts.
The commands used for this operation are:
+STCR (SIM Toolkit Control Response)
+STGR (SIM Toolkit Give Response)
The following scheme shows the SIM Toolkit commands and unsolicited results that are exchanged.
MULTI-TECH
Modem
Customer
Application
+STSF=X,XXXXXXXX
+STIN=X
+STGI=X
+STGI response
+STGR=X,XXXXXX
STEP 1: Configuration and Activation
STEP 2: SIM sends pro-active command
STEP 3: Customer application gets all the information.
STEP 4: User response is sent to the SIM.
+STCR:X