Whether explaining or complaining, joking or serious, the human voice is unmistakably genuine. It can't be faked.
Most corporations, on the other hand, only know how to talk in the soothing, humorless monotone of the mission statement, marketing brochure, and your-call-is-important-to-us busy signal.
Just seen http://giffgaff.com/ via @digitalmaverick - a mobile network in the UK, run by its members. Sounds interesting.