RE: CDMA SIM atom

[Marcel Holtmann <marcel@holtmann.org>]

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Hi Bertrand,

> > > We are working on CDMA to enable some USB dongle, and we need to get the
> > IMSI for the ConnMan interface, to create the interface name.
> > >
> > > We could use the AT SIM atom, since there should be no big difference
> > between a CDMA SIM and a GSM SIM (same kind of functionality for SIM
> > lock/unlock, same IMSI info).
> > >
> > > But we could also create a CDMA dedicated one. This will duplicate some
> > code, but will be 'cleaner'.
> > >
> > > I would prefer the solution of a CDMA SIM atom, so CDMA plugins use only
> > CDMA atom, but I would prefer to have the oFono community opinion before going
> > into the code.
> > 
> > you do not need an IMSI for ConnMan. You just need a proper unique
> > identifier that is consistent. Using the hardware serial number in case
> > of CDMA should be a good enough interim solution.
> 
> The user can change its SIM card and put it in another dongle
> 
> > We are using the IMSI for GSM since we wanna bind stored settings
> > towards the SIM card. So that hardware swapping has no effect on the
> > user experience.
> 
> This is exactly what we also want to do with CDMA dongle.

I know CDMA dongles in theory have a SIM card, but not in practice. Or
are you telling me the CDMA dongles you have, have SIM cards? And these
SIM cards are used for anything?
 
> > With CDMA we could neglect this actually. So far all
> > CDMA account are still bound to the hardware itself.
> 
> Why do you want to neglect this?
> 
> We should be consistent have have the same behaviour for this. If someone unplug and replug its dongle, he do not want to re-insert the data call parameter, as with a GSM dongle.

I still don't believe that any CDMA operator so far really uses SIM
cards. I heard about some cases with Verizon where they have CDMA + LTE
in deployment.

> And what about PIN?

Good question. It is not a SIM PIN, it is a hardware PIN in the first
place. And only if you have a SIM, you have SIM PIN.

So the same question stays, where is your SIM card in CDMA hardware that
you have right now?

Regards

Marcel