AT Command Reference Guide for EDGE Wireless ... - wless.ru

Chapter 14 – SIM-Related Commands
Chapter 14. SIM-Related Commands
The AT commands described in this chapter are related to the Subscriber Identity Module (SIM) connected to the
Multi-Tech wireless modem.
If using data from the SIM please bear in mind that the content of all Elementary Files is subject to change at any
moment!
This is true because the network can change the SIM’s data in the background via the SIM Application Toolkit (SAT)
procedure “Data download to SIM”. For a detailed description please refer to GSM 11.14.
To get informed that changing Elementary Files has taken place the TA needs to hook to the SAT Proactive
Command “REFRESH”. To achieve this, the AT command interface of SAT, i.e., Remote-SAT, needs to be activated.
An overview is given at Chapter 15, SIM Application Toolkit (SAT) Commands, additional information is available with
the document “Remote-SAT User Guide” .
14.1 AT+CRSM Restricted SIM Access
Description:
AT+CRSM offers easy access of the Elementary Files on the SIM. Access to the SIM
database is restricted to the commands which are listed at . However,
additional SIM commands are available via AT^SXSM.
All parameters of AT+CRSM are used as specified by GSM 11.11 [21]. The Multi-Tech
wireless modem handles internally all required SIM interface locking and file selection
routines.
As response to the command, the Multi-Tech wireless modem sends the actual SIM
information parameters and response data. Error result code “+CME ERROR” may be
returned if the command cannot be passed to the SIM; e.g., if the SIM is not inserted.
However, failure in the execution of the command in the SIM is reported in and
parameters.
AT+CRSM requires PIN authentication. However, using “READ BINARY”
and “READ RECORD” is possible before PIN authentication and if the SIM is
blocked (state after three failed PIN authentication attempts) to access the contents of the
following Elementary Files:
EF Symbol EF Name EF ID (hex.) EF ID (dec.)
EFICCID ICC identification 2FE2 12258
EFELP Extended language preference 2F05 12037
EFLP Language preference 6F05 28421
EFSPN Service provider name 6F46 28486
EFAD Administrative data 6FAD 28589
EFPhase Phase identification 6FAE 28590
EFECC Emergency call codes 6FB7 28599
Please beware of possible changes to Elementary Files by the network at any time, refer
to Chapter 14, SIM-Related Commands.
Test Command Syntax: AT+CRSM=
Response:
OK
Write Command Syntax: AT+CRSM=[, [, , , [, ]]]
Response:
+CRSM: ,[,]
OK
ERROR
+CME ERROR:
Parameter Descriptions:
SIM command number.
176 READ BINARY
178 READ RECORD
192 GET RESPONSE
214 UPDATE BINARY
220 UPDATE RECORD
242 STATUS
Identifier for an elementary data file on SIM, if used by .
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 193