I just read this article that summises that he 108% penetration by mobiles into NZ is because people carry two phones to save money calling the two current networks.
Now dont get me wrong, although I would love to see cheaper mobile costs (or cheaper anything for that matter) I doubt the research for this article has taken into account the huge number of people like myself who make extensive use of mobile technology as remote control devices and alarms etc, and I also wonder if mobile internet numbers are bundled into providers total customer tallys?