Their position is likely to be "No locked handsets being sold for the new network", whereas the Worldmode phones are designed to be used on the old network here, and GSM networks overseas.
Being that the W531 does not even support MMS on GSM, I just can't see Telecom going there.
The Samsung W531 worldmode phone can be "unlocked" to run on take a nz vodafone simcard, so the answer to your question should be yes, you could use an overseas sim card.
Search the forum for unlock or vodafone and samsung w351
[edit] in fact just search google for samsung w351 the instructions are within the first page of results
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