Question on Mobile Identification Number for GSM

[Dan Williams]

On Thu, 2014-10-30 at 15:02 +0000, Highland, Glenn wrote:
> Hello:
> 
> Is there a way to query ModemManager 1.4.0 specifically for the Mobile Identification Number (MIN), or do I need to
> get the IMSI from the Sim interface and just pull-off the last 10 bytes/digits?

Let's actually call this the MSIN, since MIN is a specific CDMA/IS-95
term that actually doesn't apply to 3GPP/GSM.  (MINs can be treated like
MSINs, but not all MSINs are MINs.)

You're right, at the moment there is no way to just get the MSIN as a
single property.  We could add this as a feature request though.
(There's also no function get the CDMA MIN either, but it looks like we
have QCDM and QMI methods to do that if we get around to exposing it.)

> The reason I ask is (according to Wikipedia), some MIN/MSINs could be 9 digits rather than 10, even though almost
> every place I've searched the MIN/MSIN is described as being 10 bytes long.

The reason it says they are either 9 or 10 digits long is because they
are stored as part of the IMSI of the SIM card.  The IMSI has a maximum
of 15 numbers and is composed of the MCC, MNC, and MSIN.  The MCC is
always 3 digits, and the MNC is either 2 or 3 digits.  The remaining
digits are the MSIN, which is where you get the 9 or 10 digit length
from.  If the MNC is 2 digits, then the MSIN will be 10 digits.  

So for now, you can read the "Imsi" property of the Sim interface, and
then the OperatorIdentifier property of the Sim interface.  Strip the 5
or 6 digit OperatorIdentifier (which is the MCC/MNC of the issuing telco
eg "310260") off the front of the Imsi, and you've got the MSIN.

Dan

> Any help is appreciated.
> 
> Glenn
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