Does anyone understand what's supposed to be such a big deal about the new cars with built-in WiFi? I presume that this is a service to which you have to subscribe and pay a big monthly fee. My wife often likes to use her iPad when we travel. I just kick on my T-Mobile hotspot and let her surf. We never get near my tethering limit. I wonder why T-Mobile doesn't point in their advertising that you don't need a WiFi car if you have T-Mobile's Hotspot feature.