SIM COMMANDS

On July 4, 2008, in APDU Commands, by Rebel SimCard

This transmission protocol uses Application Protocol Data Units (APDU), which can be either commands or responses. These are sent across the electrical interface between the SIM and the mobile equipment, or the SIM-ME interface for short.

CLA

INS

P1

P2

P3

Data

Command APDU format.

There are five fields in an APDU command. The class of instruction (CLA) is always A0 for GSM. The instruction code (INS) indicates the particular command to be performed. P1, P2, and P3 are parameters for the command, with P3 containing the length of the Data segment, if any.

Data

SW1

SW2

Response APDU format.

The response to a command is returned in three fields. The Data portion, if any, contains information requested in the command. SW1 and SW2 are status words indicating the success or failure of the command.

A number of commands are defined for GSM SIM cards, including functions to read and write data, confirm security features, and run the GSM authentication algorithm. Completing an entire GSM procedure may require a series of APDU command/response pairs.

COMMAND

INS

P1

P2

P3

SELECT

A4

00

00

02

STATUS

F2

00

00

length

READ BINARY

B0

offset (high)

offset (low)

length

UPDATE BINARY

D6

offset (high)

offset (low)

length

READ RECORD

B2

record number

mode

length

UPDATE RECORD

DC

record number

mode

length

SEEK

A2

00

type/mode

length

INCREASE

32

00

00

03

VERIFY CHV

20

00

CHV number

08

CHANGE CHV

24

00

CHV number

10

DISABLE CHV

26

00

01

08

ENABLE CHV

28

00

01

08

UNBLOCK CHV

2C

00

00 (for CHV1)

02 (for CHV2)

10

INVALIDATE

04

00

00

00

REHABILITATE

44

00

00

00

RUN GSM ALGORITHM

88

00

00

00

SLEEP

FA

00

00

00

GET RESPONSE

C0

00

00

length

SIM command coding.

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