Incidentally, just yesterday night I swapped my simcard off from my Jolla to my Nexus5, and when I put it back I could not get the device to recognize the sim any longer.

I first thought it was a mechanical problem and tried to twiggle the sim back and forth, to get the device to recognize it, but no avail.
I have often live-swapped simcards previously with no problems like that.

Finally I power-cycled my Jolla, and then it recognized the card with no problems.
Too bad I did not try to restart ofono before doing that, as it might have helped also.

I just wasted my uptime of 65 days for it, bummer!