said by Karl Bode:The problem, of course, is that everybody now has a 4G modem in their pocket, making the added cost of such connectivity redundant for many.
Most hotspots on phones are limited to 10-15 GB, so having unlimited data for your vehicle for $20/month is a good deal.
AT&T's connected car device is still a better deal, however, as it is not limited to GM vehicles, and can be moved from vehicle to vehicle.