I have used it in a rental car in Germany and my parents cars both have it. You can swap out devices no issue when plugged directly in. I think if you are connecting via bluetooth then you may have some syncing issues. Would say go directly connected via a cable rather than bluetooth. Easier, direct connect and nothing you need to do on the phone save unlock it.
No extra data plan, it is using the data and processing power of your phone for everything it does and displaying it in a format that works well for a car display.
“If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse and you say that you are neutral, the mouse will not appreciate your neutrality.” Bishop Desmond Tutu