How to read IMSI number from SIM

RE: How to read IMSI number from SIM

Håkon Alseth — Wed, 07 Apr 2021 06:35:42 GMT

Hi,

Query the SIM just after enabling the modem (CFUN=1), as the power to the SIM card is normally turned off to ensure low power consumption, especially in sleep modes (eDRX/PSM). Alternatively, you can issue AT+CFUN=41.

Kind regards,

Håkon

RE: How to read IMSI number from SIM

Ethan — Tue, 06 Apr 2021 16:18:16 GMT

I would like to confirm whether there is any conditions in order to acquire IMSI.

For example, when I use AT+CIMI to acquire IMSI, it returns valid result only when the network connection is established, which means acquisition of IMSI requires a network connection.

Please confirm.

RE: How to read IMSI number from SIM

awneil — Fri, 02 Apr 2021 23:20:10 GMT

IMEI = International Mobile Equipment Identity (or Identifier); it is embedded in the module - not the SIM.

A different SIM could be inserted, and the IMEI would remain the same.

IMSI = International Mobile Subscriber Identity (or Identifier); it identifies the service "user".

AT+CCID should give you the SIM card serial number (ICCID) - which the network associates with the IMSI

RE: How to read IMSI number from SIM

Ethan — Thu, 01 Apr 2021 20:27:35 GMT

Thank you for your response.

I am not sure about it. Since I can read IMEI number, I thought IMSI can be readable as well.

RE: How to read IMSI number from SIM

awneil — Thu, 01 Apr 2021 19:16:14 GMT

IIRC, it isn't stored on the SIM - it's an association that's managed within the network ?