If your car has a shark fin antenna, you can sometimes disconnect the leads for the cellular, WiFi, and/or satellite antennas that the car uses to report telemetry and private driving data back to the manufacturer or any other services. You will lose certain functionality, of course, like satellite radio, emergency services if you subscribe to them, etc. But you can then leave the GPS antenna connected.

I’d recommend disconnecting them at the source rather than the fin of possible, though, as, depending on what kind of signal we’re talking about, just the lead running through the car might be enough of an antenna to still transmit to very close cell towers. But it’s usually easier to find the wires at the fin.

Not the best solution, but can be useful in some cases. It might be a more targeted solution than some of the others like popping a fuse which may also disable more essential features.