Q&A – Visiting the US for 2 weeks in August with my unlocked iPhone

Hi,

I’ll be visiting the US for 2 weeks in August with my unlocked iPhone.
Questions:
Can I call Australia using your iPhone USA – Unlimited sim? If not how can I add in this facility?
Does this sim connect to a 3G network?
Can I get a sim delivered to a hotel in Orlando or similar, and if [...]