Using an IPhone when moving to different countries?

If I brought an iPhone say from apple out right for 529 in the UK and then moved to Australia could I use the same iPhone on their service providers?
Can then could I move to the US can change service providers again without changing the phone I bought in the UK?

Yes. As iPhones from apple are unlocked.

Your be able to use any gsm network (gsm uses a SIM card)

Hope this helps

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