Having just bought a new phone, it's interesting to note that it says on the packaging:-
Your phones Bluetooth features and Bluetooth Class ! power levels are not allowed for operation in France. To avoid unlawful interferance with radio signals, do not use the Bluetooth features in France, unless you are indoors
So, when sauntering down next June, you may think you're being a good boy, with your earpiece in. May be not.
Better take some more cash, to go along with the speeding fines!
Maybe worth exchanging messages via Blue tooth on mad friday then ! Could add some strange readings to events.