Does anybody know if MiTec Mio 8390 works in Vodafone GSM network?

I have just enquired at their website, but seeing they do not speak fluent English, I am confused..!

Below is the reply I got:

Dear Customer,
The following message is the response to your inquiry(ID:I0413629):

Subject:Re:Compatible in New Zealand Vodafone network?
Message:Dear customer,

You can use your local SIM card in New Zealand.
but we can''t make sure it can be used in new account compatible.

Best regards
Mio@support
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Hmm.. to buy or not to buy.. I am confused!