If I buy an unlocked iPhone 6 from the US, will I be able to use it in Australia?

If I buy an unlocked iPhone 6 from the US, will I be able to use it in Australia? - 1

You can use an unlocked phone anywhere in the world so yes.

Yes.

Yes, but you will likely be limited to 2G data and no mms. You will have to pay any duties and taxes upon arrival in Aus.

Yea…