This report and bug 1404179 are examples of why "should" or "need" in a
bug summary is a warning sign. :-) When a report assumes a particular
solution, multiple possible solutions may be reported separately,
fragmenting discussion. And if a particular solution is rejected, its
bug report may be closed without solving the underlying problem.
The problem here is "SIM selection for mobile data is non-
deterministic". When we make it deterministic, what rules should we
follow to make the right choice most often? Here's a straw-man proposal:
(1) If exactly one SIM is locked, choose the other one (bug 1409694).
Otherwise:
(2) If exactly one SIM is roaming, and "Auto switch to avoid roaming"
(once implemented) is on, choose the other one. Otherwise:
(3) If one SIM has a 4G connection right now and the other doesn't,
choose the one that does. Otherwise:
(4) If one SIM has a 3G connection right now and the other doesn't,
choose the one that does. Otherwise:
(5) Choose the one that has strongest signal right now. (It doesn't
matter so much if the other one becomes stronger later on.)
Even if these steps need a little tweaking, one obvious consequence is
that the algorithm should re-run whenever the result is likely to have
changed: whenever (a) you turn on the phone, (b) you lock/unlock a SIM,
(c) you toggle "Auto switch to avoid roaming", (d) you change the data
technology setting for any SIM, (e) you turn on cellular data or exit
Flight Mode, or (f) whenever a SIM switches to a different carrier, e.g.
as you drive into another country. The last one is the only non-
interactive case, which may result in a surprising break in data
connection for a few seconds, but that will be both infrequent and
important.
The variety of conditions that need testing might also help you decide
what piece of code to implement the solution in.
** Summary changed:
- [wizard] Need Mobile Data SIM selection page
+ SIM selection for mobile data is non-deterministic
** Changed in: ubuntu-ux
Assignee: Olga Kemmet (olga-kemmet) => Matthew Paul Thomas (mpt)
** Changed in: ubuntu-ux
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1379412
Title:
SIM selection for mobile data is non-deterministic
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