Are you sure your car actually has a simcard?
edit rereading I see youre asking about a potential car for the future.
I found very little info- except this, which hints at having network connectivity without a simcard (and also discusses swapping sims). But I found very little else
https://intotomorrow.com/can-you-swap-the-sim-card-in-your-car/
A second link about someone asking whether they should remove the card before returning the car. The advice says to take it out. Which implies to me, for this car at least, itll function without a sim
https://www.fpaceforum.com/threads/leave-or-remove-sim-when-turning-car-in.47642/
yeah absolutely agreed