2degrees has recently built a tower here in Whakatane so it's now cost-effective for me to move over. I picked up a SIM yesterday and have had nothing but trouble.
First, I put the SIM into my iPhone 4S, turned it on ... and got No Service. After 2-3 minutes this finally changed to "2degrees" so I called 200 as requested on the packaging only to get three short beeps and the message "call failed". The phone dropped back to No Service then a few seconds later changed to "Voda NZ".
I called 200 again and got the same three beeps and "call failed". At this point I turned the phone off and put my Telecom SIM back in. That was yesterday.
I've just tried it again. I put the 2d SIM in, turned on the phone, and got No Service again. This time it went to "Voda NZ" after a minute or so (with a coworker's iPhone showing "2degrees" at the same time). I tried calling 200 again and instead of getting setup prompts as indicated in the documentation, it just tried to connect me to the helpdesk. However, once I terminated the call the phone changed over to "2degrees" and has stayed on it since.
I entered the APN settings and at about this time received a text from +200 saying that I'm out of credit. I was under the impression that a $10 SIM was supposed to include $10 of credit so this surprised me. A little Googling indicated that I need to register for Your 2degrees before I can get this so I went to the 2d site and started following the instructions.
I entered my number and the password that they texted me, and was asked to pick a new password and hint. I did this, clicked Next, and got HTTP 500 (internal server error). At that point I gave up and decided to rant on Geekzone :)