Once upon a time...
A long time ago, when men were men and mobile data was HSPA, some equipment (USB Mobile Internet stick, laptop, etc.) was assembled in the back seat to stream BBC WS from the mobile Internet onto an FM modulator so one could listen to it during a planned inconveniently scheduled drive.
It was noted that the HSPA mobile network at that time was guaranteed to maintain the connection only up to 160mph (100mph). Science experiment beckoned. Apparently they had a margin well beyond that spec, as lock was maintained.
Anyway, mobile privacy can be restored if you can drive fast enough to break the data connection. They're probably reliable to maybe 300kmh now, so good luck.
Biting the hand that feeds IT
