How to use unlocked SIM-card free iPhone 5s?

So if I buy an iPhone 5s that is unlocked and SIM-card free in the US, can I use it in New Zealand and China by using a nano-SIM card from a local GSM carrier in one of those countries? Will it be able to work properly and make calls?

Yes. Just stick in the SIM & be good to go.

I recommend you buy sim card iphones if you plan to travel, e.g. GSM, you can just switch sim card and your phone will be working, assuming it's unlocked.

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