Get IMSI before connecting

[Andrey Dodonov]

I'm implementing APN lookup based on MCC MNC, which I try to obtain from IMSI using AT+CIMI.

However, AT+CIMI it returns valid result only after trying to connect for some time via AT+CFUN=1
I tried running AT+CIMI after AT+CFUN=0 or AT+CFUN=4, but after that it yields NOEXEC, -8

I don't want to perform any connection attempts, I just want to read out IMSI as soon as possible.

Is it possible?

Thanks a lot!

[Didrik Rokhaug]

Hi,

You can activate the UICC (but not LTE or GNSS) with AT+CFUN=41.

Best regards,

Didrik

[Andrey Dodonov]

Hi,

thanks a lot, seems to work!

Is it normal that it works only roughly after one second?

[Didrik Rokhaug]

I haven't tested a lot of different SIM cards, but for the iBasis SIM card I tested, it took roughly 1 second from I gave the AT+CFUN=41 until all the communication with the SIM card stopped.