Aleksander, The Twilio Super SIM will send a Proactive Command NAA Initialization and Full File Change Notification to the terminal on the IMSI change. Some modems, like the Quectel BG95 or EC25 will send a URC if +QUSIM: 1 if it is a USIM and +QUSIM: 0 if it's a regular SIM no idea about other modems however.
I can arrange to get you a SIM for testing if needed as this is an area I'm interested in as well. I can also provide a SIMtrace2 pcap (or raw APDUs if preferred) capture of the communications between the terminal and the SIM if that would be helpful. On Wed, May 3, 2023 at 6:24 AM Aleksander Morgado <aleksande...@chromium.org> wrote: > > > Does ModemManager support SIM application tool kit with proactive SIM > > > commands? My assumption is most of these SIM application tool kit > > > commands should be handled by the modem but I'm unclear what is the > > > role of host CPU / ModemManager in these commands? For example, many > > > SIMs support multi-IMSI i.e. depending on the location, a particular > > > IMSI is used for network connection. When a SIM changes its IMSI, the > > > SIM application tool kit applet sends a REFRESH proactive command to > > > the host device (or modem). This instructs the device to re-read the > > > data on the SIM, including the new IMSI. > > > > Currently, ModemManager does not support any SIM application tool kit > > commands. SIM toolkit apps displaying emergency numbers etc. are > > currently not possible with ModemManager. > > > > > > > > So how shall ModemManager know that IMSI has been changed and what it > > > is supposed to do? What is the role of ModemManager in handling these > > > commands? > > > > If the modem emits an AT URC / QMI / MBIM Indication, ModemManager > > might be able to handle it, but I'm not sure. > > > > This is right. As we don't support generic SIM STK operations in MM. > We currently only support the multi-IMSI scenario on QMI modems when > they send an explicit notification about the change (e.g. UIM Refresh > indication, see 5c0db3743209b78d8c7b7558e337e6df25951bae). > > I actually need to investigate the IMSI switch procedure while in > MBIM, it's in my TODO list for the next weeks. I assume that maybe > using the STK service we could be notified of the same. > > -- > Aleksander >
