The sysmoUSIM-SJS1 is programmable and Java capable USIM card. Not all commands are known yet and this page should grow over time. Each card is using a separate ADM1 key and the default configuration is hacker/developer friendly (fields being writable, reduced security for installing applets to have more quick development cycles).

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User Manual

sysmocom provides a comprehensive user manual at - please refer to that manual rather than this rarely maintained wiki page for most up-to-date reference information.



The sysmoUSIM-SJS1 can be parameterized using pySim and sysmo-usim-tool.

PySim provides the common general bulk provisioning features, which are already known from MagicSIM and previous sysmocom simcard models. Most of the settings (like Ki, ICCIC, OPC, etc...) listed below are covered by PySim.

Please see the program from git:// ( and


For tweaking higly sysmoUSIM-SJS1 specific parameters (authentication algorithms, milenage parameters, enable/disable USIM application etc...), sysmo-usim-tool can be used. For more information see section "7.2 sysmo-usim-tool" in the provided manual.

Please see the sysmo-usim-tool program from git:// (

SIM Toolkit

Please see for a tutorial on installing and removing a SIM Toolkit applications.


sysoUSIM-SJS1 is available from in both 2FF+3FF (micro) and 2FF+4FF (nano) form factors.

Command Reference

Please primarily refer to the user manual for more detailed information!

To understand this reference, it is assumed that you are familiar with basic knowledge on smartcard
technologies, such as standard ISO 7816-3/-4 APDUs and GSM TS 11.11.

The below should be possible to set after authenticating with the ADM1 pin

Setting the IMSI

Use a standard UPDATE BINARY command on EF.IMSI (7F20/6F07)

Setting the ICCID

Use a standard UPDATE BINARY command on EF.ICCID (2FE2)

Setting the Ki

Use a standard UPATE BINARY command on EF.KI (7F20/00FF)

Setting the OP/OPC

Use a standard UPATE BINARY command on the EF.OPC (7F20/00F7)

Offset Size Description
0 1 0x00 for OP, 0x01 for OPc
1 16 OP or OPc value, depending on byte at offset 0

Setting the Algorithm(s)

Use a standard UPDATE BINARY command on EF.AUTH (7FCC/6F00)

Two bytes, first byte for 2G, second byte for 3G.

Value Algorithm Supported Mode
01 Milenage 2G + 3G
03 COMP128v1 2G
04 XOR 2G 2G
06 COMP128v2 2G
07 COMP128v3 2G
08 XOR 3G 3G

Setting the Milenage parameters (Ci/Ri)

Use a standard UPATE BINARY command on EF.MLNGC (7FCC/6F01)

Offset Size Description
0 16 C1
16 16 C2
32 16 C3
48 16 C4
64 16 C5
80 1 R1
81 1 R2
82 1 R3
83 1 R4
84 1 R5

sysmousim-sjs1-h-50p.jpg (512 KB) laforge, 03/17/2017 05:01 PM