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mobilefirmwaresim-card

Is it possible to update/modify IMSI number of a SIM card?

Is it possible to edit an existing IMSI of a SIM card by overwriting the EF_IMSI file system? If yes then can we do this by using AT Commands or how can we do it?

Thank you very much for your help

Solution

  • Yes you can change Data of EF imsi Just run the following commands

    a0 a4 00 00 02 3f00 -> Select MF

    a0 a4 00 00 02 7f20 -> Select DF_GSM

    a0 a4 00 00 02 6f07 ->Select EF_IMSI

    a0 d6 00 00 09 <9 bytes of MSI data> -> Update IMSI

    These commands are ISO 7816 commands.To know more about commands and file structure of SIM.Please refer link,For commands goto page41. To run these commands you can use link