Unfortunately these logs don't bring any more insight as to what might
be the problem (or at least, they don't help me figuring it out), it all
looks like it connects fine?

Then the drei modem disconnects, either because it is pulled or fails in
some way. Can you provide more information? Which modem was plugged in
first, followed by which, so we can clearly see what is failing when you
connect both simultaneously?

>From what I can tell now the drei modem was first, followed by the
t-mobile one, but unfortunately it's not the same NM or  MM processes;
ideally we should be able to see one full session with everything to
tell what goes on.

So far, I think we can safely say we've established it's not an issue
with the modems and probably not ModemManager, so if you could run
NetworkManager in debug mode just once to show a full session
(connecting both modems, seeing each device loading the wrong
connection). Here's how you can start NM in debug mode:

(reboot first, so we have a clear starting point)

sudo stop network-manager
sudo /usr/sbin/NetworkManager --log-level=DEBUG 
--log-domains=CORE,HW,MB,PPP,AGENTS,SETTINGS,DEVICE

The log-domains settings should allow giving all the information we
need, while still being a manageable load.

Reproduce the issue, then attach /var/log/syslog (after checking it
doesn't contain sensitive information).

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https://bugs.launchpad.net/bugs/627883

Title:
  Two mobile internet sticks conflict

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