Will an iPhone bought from American work in Australia?

I live in Australia and want to buy an iPhone 4s off eBay from American, will the phone work in Australia? It is unlocked

Yes, definitely it will work any GSM network SIM card in any country.

Yes, as long as it is unlock then you don't need to worry about it. You can definitely use it with any carriers.

  • Would an American iPhone 5 work in the UK? I'm going to Florida in a few weeks and was wondering if I bought an unlocked iPhone 5 in an apple store whilst I'm there, would it still work properly if I inserted an O2 sim when I got home? I've been researching a little and on the US Apple website it said the unlocked iPhone 5 is available to any GSM carrier. So will O2 work?
  • Will my iphone 4 work in Australia? I just bought an iPhone 4 and will be traveling from the US to Australia. Will I be able to make the occasional call with my iPhone? My provider is Sprint. I understand it may be expensive per minute, but I just want to know if upon arrival I can step out of the airport dial a friend in Australia's number and it will go through. If not, what do I need to do to make this happen?
  • Will my Australia vodafone iphone 5 work in Ireland? I have an iphone 5 thats with vodafone, and i was wondering, if i unlock the phone from telstra when i go over to ireland, will i just be able to buy a prepaid sim card there and put it in my phone and use it? And if i unlock my phone, will it have any bad affects? Will i still be able to use my plan and the sim card i originally got with it?
  • Will at&t services work in australia? (iphone 4G)? I'm planing to travel to australia for a month from america. I need my iphone gps to navigate through austrialia while walking around. For this, i'll be needing my 4G. Will at&t services work in australia, such as calling, texting, and most importantly--4g?