I, along with nzbullet, have been floating around here for a little while now, helping people with various fixes to get their iPhones running properly on the Vodafone NZ network.
Well, to simplify things, I have just created an Installer repository which will enable you to install our fixes directly onto your phones via Installer (which all good jail-broken phones should have :)).
Just go to http://www.kiwi-ise.co.nz/ and it has all the details of how to add our repository to your phone. It includes most of the fixes we discussed and supplied solutions for in this thread.
Hope this helps a few people out there
Depending on interest, we will continue to develop more fixes and mods specifically for the Vodafone NZ iPhone user.