Contributed by: SaradIf you bought your phone outside New Zealand, chances are that Internet would not work by default when you topup your mobile phone with a data plan(or other free limited offers). They however have enough information on how to set the Access Point Name(APN) for your phone on the Vodafone New Zealand website here.
Even if your phone model is not on the list, you can look at the information provided for the available models and once you get the general idea of how things work, try it out on yours.
While using Android phones, downloading APNdroid and Quick Settings for free from the Android market will help you disable your internet when you are not using internet over phone. This may be a good idea if you are on a limited bandwidth plan and not monitoring your daily internet usage!