The Harman Spark is a "Connected Car" device from AT&T that plugs into a vehicle's OBD-II diagnostic port, automatically creating a Wi-Fi hotspot for up to 8 devices when the ignition is turned on.
Up until recently, this device could be paired with an unlimited data plan costing $30/month which could be used in a vehicle's OBD-II port while the vehicle is running to provide unlimited shared data for devices.
This plan is no longer available on AT&T's website. Now, rate plans for the device start at $10 per month for plans without Wi-Fi, $25/month for 5GB, and $40/month for 10GB.
An unlimited data plan still appears to be available for vehicles with integrated diagnostic and data sharing systems - like OnStar.
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