Can i put in a NZ sim card into my UK iphone?

Question

Hey guys it may have been asked before but basically I'm from the UK but have been living in New Zealand for the past 2 years and will be going back there in a month to spend another 12months there. I bought an Iphone 4s this week, through T-mobile. Not yet turned it on or activated it yet, my question is, if I turn it on and insert my NZ Vodafone SIM into the phone, wil it be then locked to my NZ network(which I want) despite being in the UK.
Or should I just put my T-mobile sim in and hope that it accepts my Vodafone NZ sim as well, or buy a Vodafone UK sim card, put that into the phone with the belief that I will be able to put my Vodafone NZ sim into it with no problem.
At the time of writing I am in the UK, I just want to get the all clear or good advice, as I will be living in NZ therefore want this phone to be activated/locked to a NZ sim card.
Any advice would be appreciated.

Answer 1

http://support.apple.com/kb/ht1937
Accoprding to Apple's information, all UK phones are sold as locked to the carrier you got it from, so yours is ALREADY locked to T-Mobile (activation has nothing to do with whether a phone is sold as locked or not).
However, it looks like, from Apple's listing, that they also support unlocking, but you will need to contact them about doing that.  There may be restrictions, like so many months under contract first, or a fee, or whatever rules they apply to unlocking.  Or there may be none and you just need to ask them to do it.
Regardless, you need to contact T-Mobile and ask them about how to get an unlock request processed by them.  And do it before you leave - much more difficult to deal with once you are far removed from their network.