That was at least a carsharing car. It's a well-known fact that these need connectivity (your only means of unlocking them is the app, after all) and have a severely limited area where you could drive them. Though that one time when I took a carsharing car 70 km away from the city where it apparently couldn't communicate (but my phone had LTE) it didn't disable itself, it just didn't lock when the app thought it did. So it does depend on the particular way the particular company implemented its remote control unit I guess?

I'm talking more about the situation where it's your own car.