[montibbalt]

You actually TALK on the phone? I have one of the smallest voice plans AT&T offers that still has unlimited text and even that has way too many minutes. I think the only number I actually call is my parents' land line. Even my dentist's office texts appointment reminders instead of calling. I'd think one of the biggest reasons for slow adoption is the same as our broadband adoption- It's hard for effectively 2 big companies to reliably provide service for 300 million people spread out over something like 8 million km^2 (for the lower 48 states) and have it still be affordable. For example a friend of mine still didn't have internet access at all in the 2010s because they would have had to pay to have special construction done near their house in addition to the high monthly bill.