At the recent Mobile World Conference Samsung has released a dongle that plugs into an existing connector in your car and gives you and your passengers a mobile hotspot for full-time wifi connectivity.
Called the Samsung Connect Auto, the device plugs into the car’s OBD II diagnostic port which provides power. Any car or light truck made in the last 20 years has an OBD II port – this is the port that your mechanic uses to read diagnostic codes for the car and if your state has an emissions test, that reading is obtained through this port, as well.
Initially it appears this will be available through AT&T at around $10 month and will offer LTE speeds. Look for availability around April or May.