What do I need to do to use my iphone overseas?

I want to take my iphone overseas to take photos, update my status/pic on facebook and to be able to sms home to Australia. I have unlocked it and Vodafone has told me to get a sim over in the US, is that all I need to do?

Yeah, if your cell is unlocked you can use any carrier.anywhere. And camera is a function of the phone so no data charges. I hope that's a help. Oh make sure that the sim you buy has a data plan.

You should be all set assuming you have unlocked it successfully. Just make sure in the US you subscribe to a service that uses GSM technology and not CDMA. You can only use this phone with a GSM network.