Detect free roaming

[Vincent Bernat]

 ❦ 25 mars 2016 10:24 +0100, Aleksander Morgado <aleksander at aleksander.es> :

>> My plan including free roaming in some countries. On my Android phone,
>> when I am under this condition, the phone doesn't display the "R" for
>> roaming. So, it seems to detect that I will not be charged. With modem
>> manager, there is no such distinction, I always get the "roaming"
>> mention.
>>
>> I don't know how the free roaming stuff is detected. Any chance it could
>> be advertised correctly?
>
> SIM cards have some files where operators can specify "networks which
> they can be assumed to be the home network" (SPDI list IIRC). This is
> the case e.g. for virtual operators which don't have their own
> network, and may also be the same case for your sim card. In
> ModemManager we specify "roaming" always if the device is not in its
> home network; the modem itself reports that roaming flag in that case,
> without considering the SPDI list. There's a very old branch which
> added some support for parsing SPDI list and showing the correct
> operator name (i.e. the SIM card operator instead of the service
> provider network operator when needed), but that never got merged:
> https://cgit.freedesktop.org/cgit/?url=ModemManager/ModemManager/log/&h=aleksander/display-rules
>
> Not sure if you could give that a quick run, although not sure if it
> even works with the modem you're using. The parsed SPDI list would be
> shown in the "mmcli -i 0" output (showing SIM info).

I have compiled it but unfortunately, my modem is not supported. I tried
to rebase on master, but there are some small changes that need to be
done. I am not motivated enough to explore this issue since I can check
my phone to see if roaming is free or not.

Thanks for your help!
-- 
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