How to find ICCID? [answered]

Thanks, that works! For those who arrive here looking for the same answer: the tool is called CSD, and it can be run by typing csd in the terminal (root not needed). The ICCID is listed under "Card identifier".

Also, funnily enough, inside CSD that test reports status "Fail - Modem count: 2 (expected: 1)". I guess someone forgot to update it for dual-SIM phones... :)

@Federico - perhaps you should post that problem as a new question to make Jolla aware.

@Edz seems such a minor thing that I wouldn't worry, there's much worse bugs unfortunately. :)

I'm not worried either, I don't have a dual sim phone, but 2 other people have have voted your comment, meaning they likely have the same problem. There are certainly many worse bugs and the one you've found should be added into the mix.