Update to FAQ for 2G/3G Frequencies:
For U.S. market, the K8/Mini/D5, and all the others, are a bad buy. 2100 3G isn’t used by itself in the U.S. (T-Mo requires 1700/2100 AWS support or 1900), and 850 3G is extremely limited.
2G coverage is slated to go away for AT&T customers by Jan 1st 2017.
If I had known would not have bought the watch. Good for the next guy considering buying.