???
What kind of car is it? Sounds awfully strange to me that the gps system, which uses satellite information not cellular data, requires a sim card to operate and that such a system would be fitted to a car but not actually working. Normally they fit a full gps navigation system or a unit that allows the car’s systems to work like they should, but without the navigation system built into it. I.e; reversing cameras and radio but no nav.
The navigation system in our car works off an SD card, but that’s for up to date maps and came with the car (maker option, paid for). An updated card is about $200$150$100 IIRC. It doesn’t need data to function, but if you allow it access to the interweb, it can offer traffic updates and a few other niceties we don’t really need so don’t let it access the interweb, although it’s usually bluetoothed to my phone because I like to listen to music. If I tell it, it’ll connect to the interweb but it doesn’t need it to function.
Sounds really strange to me.
After some googling, Mazda? It’s not a sim card, it’s an SD card and something that can’t be readily hacked or circumvented by the sounds of it. Path of least resistance would be to extract the card from them by any means possible and insert it yourself (armrest apparently?) and yes, it locks to the VIN after 100km/62 miles so a used one isn’t going to work either.
It’s so they can fit a standard unit to every car (saving $$$), and have everything work like it should (ease of manufacture), but hit you for that extra $400 if you really want navigation (nav is still an option).
Good luck,
Stu.