Test-driving OnStar 4G LTE: Geek-heaven or Gimmick?

GM has been talking about baking 4G LTE into its cars for some time, but the first examples are just now rolling off the production line and into dealerships. Upgrading OnStar with a 100x faster data connection, it adds support for mobile hotspot sharing, remote control by smartphone and smartwatch, and third-party apps and services. I jumped into some of …