French? Not likely. Quebecoise? Mais Oui.

There is the courtesy aspect of not using cell phones of course but the real issue re cell phones really concerns the effect it will have on an emergency evacution or other aircraft crisis:
-possibly interfere with others hearing the Cabin crew directions.
-possibly miss the cabin crews directions themselves.
-introduce possible projectiles into the cabin that can kill or seriously injure.
-Maybe the phone doesn't become a projectile. Maybe the user just drops it. I've no doubt, in some evacutions, some folks will actually stoop to find or search for their dropped phone, palm, etc., obstructing peoples path's.