You have to go into one of the phone menus to allow connection by bluetooth - there is a check box for it. I think it only works while the car is stationary with the engine off... However, having managed to get the browser to work via my iPhone 6 (4G) the connection was so slow as to render it useless. It was no faster via 4G than it was on my old phone with 3G.
It is very unlikely that a USB Data stick will work as it will probably not interface with the on-board 'tablet'
If I want a bigger screen than the iPhone, I now carry my iPad - 3G connected.