My sim in an unlocked phone?

Shadow Blade

New member
I am looking to buy a unlocked phone off Ebay, but it doesn't work with 3G. I have a 2degrees sim card over here in New Zealand, will it work in the phone? The title is "GSM 4G WIFI Unlocked AT&T T-Mobile Cell Phone" and it says will work with Network: GSM 850 900 1800 1900 but not with 3G.

So will it work? Or is there any way to change the sim to work on the GSM type of network if I need to?
 
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