Or do phone + simcard swapping and use a higher level system for communication. So the mobile network as a whole becomes a communication channel where the mobile number itself is irrelevant. It’s only used as a mean to get on the network.
Havent give this too much thought yet but it could work.
That way Cellular Operators / Government can't see what you're doing (assuming VPN, no leaking, etc.) but they still can track where you are, very precisely, every second your phone is not in airplane mode or off. And with location, they know a LOT about you, potentially can infer identity at some point.
Havent give this too much thought yet but it could work.