Thanks, an interesting observation about the TWO SIM cards!
Indeed I DO have two installed, albeit NOT online at the same time. Most of the time only WLAN is on, not the SIM cards.
Of course my tablet is rooted, as I explained with my XPrivacy 'identification' mods. I do have the Xposed framework and other goodies on board.
Also a few IMEI changer apps, but am not sure what I should enter, just another one? I quickly glanced at the version.xml file of Navigon and all looked OK to me (no "1234" or "1111" stuff inside).
Not that I am dependent on any navigation apps, but this stoic 'an error has occurred' is nagging me for years. I want to UNDERSTAND and also to HANDLE this weird issue on my phone and tablet.
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