Hi Martin,

>>
>> If this is a QMI card, then setup_sierra isn't the right place for
>> this detection.  It should likely be setup_gobi.
>
> Yes, you're right. It came from Bjørn Mork's patches who did this patch :
>
> https://lists.ofono.org/pipermail/ofono/2013-February/014239.html
>
> The "gobi" driver is plugged "manually" by ofono_modem_set_driver function
>
> This card is mainly QMI but also have Diag, NMEA and AT interfaces
> (ttyUSB). I think that's why he did it in setup_sierra.
>

What is the AT interface capable of?  Can this modem be driven using AT 
commands instead?  Would certainly be easier to debug.

>>
>> Your modem doesn't seem to want to read anything from the SIM.  So
>> that is why your gprs isn't showing up.
>>
>> Do you have a SIM in there or a PIN set?
>
>
> OK, so I understand that Data feature is detected by scanning SIM
> capabilities + chip capabilities (UMTS, LTE, ...)
> Am I right ?

Sort of.  oFono is a full telephony stack, so we expect the basics to be 
provided.  IMSI availability tells us that the SIM has been initialized 
to the point that it is useable.  E.g. PIN has been unlocked/entered.

>
> My SIM doesn't have PIN and I can use Standard QMI tools (libqmi) to
> bring up a connection.
> I will so investigate around SIM QMI requests / replies.

Are sim operations supported / working on this modem with libqmi?

Regards,
-Denis