[Indicators] Use a roaming indicator for each SIM on dual SIM phones

[Yuri]

For dual SIM phones, the roaming indicator should be related to each SIM, by having a "R" sign on the top of each signal strength indicator, or by having the roaming indicator in red (or another color) or by having the indicator blinking.
I live near a border, and I work on the other side of this border: I have 2 SIM's, one for each country. As the phone is sometime "lazzy" to connect each SIM to the right operator as soon as it becomes available, when I switch from one country to the another, I'm not able to check if both SIM are on the right network: sometime, I place or I receive a call thinking I'm not in the roaming mode... and it is not true.
The work around consists to go the the system settings of the phone to check each SIM card and its associated operator.
Having an roaming indicator dedicated to each SIM could help: a quick glance is enough to check the card status.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Zukowski (michael-zukowski)]

In my case I have to activate roaming to obtain mobile internet access, even in my home network. I use dual sim with a German and Ukrainian Sim. In Germany I have to activate roaming even with my German card. Additional SIM 1+2 is always mixed up in the unlocking dialogue.

[Antti Kaijanmäki (kaijanmaki)]

Thank you for the bug report.

As this report mostly deals with design proposals, I'm adding ubuntu-ux to the list of projects to get design department to weight in.

@yuri: You can check the associated networks from the network indicator more quickly than going through system settings.

Roaming indications should already be shown per modem inside the indicator as well, but fixing bug #1366014 also makes it apparent which SIM is used for mobile data so you can verify easily if you are using a roaming connection for the data.

@michael-zukowski: for the roaming in Germany with German card, please file a new bug here:
https://bugs.launchpad.net/ubuntu/+source/ofono/+filebug

@michael-zukowski:
for SIM 1+2 always being mixed up please mark the bug #1447479 also affecting you.

[Michael Zukowski (michael-zukowski)]

@Antti Kaijanmäki: Many thanks for the hint. I confirmed that bug #1447479 affects me.