12/22: mobile phones

I grew up in the days of land-lines and different kinds of calls--local, toll, and long-distance.  Toll and long-distance calls meant additional charges.  When cordless receivers became widely available, it was a big deal.  When phone plans offered the flexibility to make long-distance calls to certain people for free (or at a discount), that was also a big deal.  Now I take for granted the ability to talk with people across the country, and sometimes for hours, as part of regular service.