[PATCH] Read EF-SPDI and use it for SPN display.

[Denis Kenzior]

Hi,

>When the operator is one of those listed in EF-SPDI then we need to
>treat it like a HPLMN in deciding whether the SPN or PLMN name should
>be displayed.

Patch has been applied.  I fixed a couple minor style issues.  Thanks.

>---
>I was also going to try implementing the semantics described in EF-PNN /
>EF-OPL but I have not found evidence that it's not already handled by the
>modem in the responses to +COPN (i.e. it may already be taking care to
>substitute the network names?  is this specified somewhere or would this
>be very unlikely?)

Unfortunately +COPN is based on the operator list stored in the modem itself.  
This generally means this list is pretty much garbage after a few years.  
Check 22.101 Appending A, Section A.3.  Basically the +COPS=? lists the 
operator names stored in the ME, +COPS? is likely to report the NITZ name once 
it arrives.  The SIM EFpnn and EFopl is not queried unless you use vendor 
extensions.

For us the strategy should probably be:
- If EFpnn / EFopl exists on the SIM, read and cache
- If EFpnn / EFopl exists on the SIM and cache already exists, delay updating 
cache until later
- If EFpnn / EFopl cache name exists, use that name
- Otherwise use COPS name.

There's also the possibility of including our own database of mcc/mnc 
identifiers along with operator name and operator country.  This would probably 
have higher precedence over the COPS name.

Regards,
-Denis