GRcard SIM 2

The GRcard SIM version 2 is a programmable GSM SIM card.
They are used by sysmocom for the sysmoSIM-GR2.
These are different from the previous sysmoSIM-GR1

There is limited card programming support in ​


  • ADM is access level 05
  • SUPER ADM is access level 0b, and the default PIN is 88888888 (encoded 3838383838383838)

Command reference

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 ETSI TS 51.011 (previously GSM TS 11.11).

Writing files

Files (ICCID, IMSI, …) can be written using the standard SIM commands (UPDATE BINARY/RECORD).

Security: ADM


Uses a non-standard APDU A0 D4 P1 P2 08 PIN

  • P1: #a for PIN, 3B for PUK
  • P2: CHV number, as in VERIFY CHV for PIN (01 for PIN1, 02 for PIN2, 05 for ADM, 0b for SUPER ADM), and as in UNBLOCK CHV for PUK (00 for PUK1, 02 for PUK2)
  • PIN: 8 byte PIN/PUK, encoded as in VERIFY CHV

Security: ADM

Ki & algo

Ki & the A3A8 algorithm are store in the transparent file EF.WEKI (id 0001) under DF.GSM (id 7F20)

binary value: 0010 ALGO Ki

  • ALGO is the A3A8 algorithm used:
    • COMP128V1: 00
    • COMP128V2: 01
    • COMP128V3: 03
  • Ki: 16 byte secret key

Security: SUPER ADM