We are traveling to New Zealand for a month and are trying to find out how best to be able to call back to the US, and within NZ. The ATT international rates are outrageous. We have Fring on two iPhones that will be in NZ, and one back in the US, but that limits us to wifi connections. Another option, Truphone, also does not seem to allow use for roaming cellular calls, but to wait until you have a wifi connection. So, how to call within NZ, especially between our 2 phones there? Can we get cheap Vodafone sim cards and use those for calls within NZ? If I turn off the phone (Airplane mode) can I still access phone voicemail messages and email through web in NZ? Any other options for cheaper phone usage in NZ?