How can I make totally free calls to New Zealand mobiles using a VOIP service?

I need to call my friend on his mobile in New Zealand. I've been looking for voip software online to do that but it was to no avail. I found sites but New Zealand was not included in their free countries list, and if it was, then calls were only allowed to landlines…Can someone please help me…!!! Thank u in advance.

Related posts:

1. How to make international telephone calls to India using voip service, is there any provider for free service?
2. How to make international telephone calls to Inida using voip service, is there any provider for free service?
3. How do I use Skype and another program to make free VOIP calls to landlines?
4. Is it possible to make voip calls through a mobile?
5. Is it free to make calls using VOIP on iPod Touch?