Will my Iphone 5 work in another country?

I'm planning on going to America and need to use my phone. I won't be needing it to call people, just to browse the web and to listen to music.
My phone IS unlocked. Will I need to change the sim or get a sim from America?

I'm from Australia btw.

Yes it will work.

Yeah it works anywhere but the costs will be higher unless you have a international calling contract.

Yes it will work fine.

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