Sorry to start yet another thread on this guys.....
But I was just exploring the new Vodafone website... And while I was trying desperately to find how much international video calls are (which I couldn't find), I came across the Prepay Terms & Condition....
http://www.vodafone.co.nz/personal/about/legal-stuff/terms-and-conditions-prepay.pdf
In particular, Term 14(e)...
Quoted: "If you Port the Vodafone allocated Mobile Phone Number to another Mobile Service Provider, you will not be able to Port that Mobile Phone Number back onto a Vodafone Prepay connection, you will however, be able to Port it back onto a Vodafone On-Account connection."....
Hey....... Maybe I should really bring this to Fair Go...