When I was shopping for a cell phone, it came down to two choices: Sprint or Verizon. Both offered a basic plan of 400 minutes a month for about $40 and seemed generally comparable. However, Sprint’s free nights begin
at 7 o’clock, rather than 9, allowing me to make most of my calls without racking up minutes. This seemed to be a great advantage, until one of my friends pointed out that he and everybody else he knew had Verizon,
