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[Simon Raffeiner <sturmflut@xxxxxxxxxxxxxx>]

This now affects the MX4 (arale) and Aquaris E5 (vegetahd) as well.

I would like to make a case to rise the importance of this bug to
something higher than "Wishlist". Ubuntu currently has no way to
generally disable Roaming, my phones are constantly roaming to the
"other" national network when a tower with better service is in range,
and the data connection drops. So I am forced to enable Data Roaming to
keep the data connection alive, which I then have to remember to turn
off every time I come near a border or cross a border. I travel a lot
and live near the french border :/

The solution for this is in the Android codebase. If I put the same SIM
in my Nexus 5 with Android 4.4.4, everything works automagically. I
don't even have to enable Roaming at all, the phone switches between
both networks as if they were a single one.

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https://bugs.launchpad.net/bugs/1449990

Title:
  National Data Roaming

Status in the base for Ubuntu mobile products:
  Confirmed
Status in ofono package in Ubuntu:
  Confirmed

Bug description:
  Situation:
  German mobile network operator "o2-de" (MCC 262, MNC 07) has merged with another operator, "e-Plus" (MCC 262, MNC 03). Both operators have decided to allow national roaming between their networks for all customers and for all services (phone calls, SMS, data). The "other" network appears to the customer with the name of their original, provider, but an  added plus sign, e.g. if you're an "o2-de" customer the e-Plus network will appear as "o2-de+" to you.

  
  Expected behavior:
  The bq Aquaris E4.5 roams into the other network if necessary and all services are available. Ideally the device would not even go into "real" roaming mode because national roaming is different from international roaming.

  
  Actual behavior:
  The bq Aquaris E4.5 roams into the other network and mobile data is deactivated because the phone does not differentiate between national and international roaming. The "mobile data roaming" switch has to be explicitely enabled, which can cause problems for the user since the phone supports two SIM cards.

  
  Complications:
  - Both operators are changing their networks during live operation, other phones have problems too.

  - There is a long list of MVNOs and every one of them has to adapt to
  the changes too. For example I have a SIM card by o2-de MVNO
  "netzclub" in my bq phone and the network list now also shows the
  expected "netzclub+" entry, roaming to it works. On the other hand I
  have a SIM card by e-Plus MVNO "MEDIONmobile" in my Android Nexus 5
  and there the network list does not show the expected "MEDIONmobile+"
  entry, but just an entry for "o2-de", and I cannot roam to "o2-de"
  even if I force it.

  
  Notes:
  II think there should be a similar situation in Sweden, where operators Tele2 and Telenor created a shared 4G network, and there are probably other countries with comparable setups.

  
  Debugging data:
  - I added the output of /usr/share/ofono/scripts/list-operators on the bq phone.

  - I added two outputs of /usr/share/ofono/scripts/list-modems on the
  bq phone, once while connected to my original "netzclub" MVNO network
  and once while roaming in the "netzclub+" network. All personal data
  has been removed, but I am willing to share it in private.

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