How to use an iphone from Australia in New Zealand?

I have an iPhone 3gs 8gb from Australia (cos that's obviously where I live) and I'm going on a holiday to New Zealand in a few weeks, I was just wondering what I have to do to be able to use my iPhone in New Zealand?
I was looking at phone companies and I noticed that Vodaphone runs in New Zealand and if I take out my Virgin Mobile Australia sim card and put in the Vodaphone NZ sim card, will it work like normal if I buy credit?

My new iphone 5 won't sync all of the information saved on my iCloud?

I recently bought a new iphone 5 and was transferring data from my iphone 4.It was syncing for an extremely long time and I noticed that all of my pictures were done syncing but it continued to say 'syncing' on the phone and on itunes. It's been saying 'Step 6 ouf ot 6 Syncing' for over 24 hours when it obviously is done syncing the pictures. I'm guessing my other apps and such can't sync unless all of my pictures are done syncing, but there are no more pictures to sync. This is very confusing. On top of that, my contacts won't sync either and my apps won't finish downloading/installing. If anyone could help me I would greatly appreciate it.

How to secretly activate camera?

There's this chick in school and she likes to borrow my iPhone 4s duting class. And she like to mess around with it. She also sticks it down her shirt to tease me. I was wondering if I could activate the video camera and get a quick vid of her amazing rack?

Do you turn your iPhone sideways to text?

I was texting on my iPhone and my friend was astonished by how I was texting with my phone sideways so I could use my thumbs… She stated that no one does this. While obviously I know her statement is incorrect due to the fact that I'm indeed someone, I wanted to take a little poll.