Turn your 1996 or later vehicle into a mobile hotspot with this AT&T ZTE Mobley Wi-Fi hotspot, which features a 802.11b/g/n wireless standard and 4G LTE speed for fast, reliable Internet connectivity for up to 5 Wi-Fi-enabled devices.
I like this little device a lot. It comes on when the car starts, it turns off at a configurable amount of time after the engine is shut off (30 minutes, 1 hour, 2 hour, 4 hour, indefinite). I haven't been out of metropolitan areas yet to determine reception in fringe areas, but within the metro it's been great.