We were looking at putting myself on the Hiptop Slide (Australian version of the Sidekick Slide) deal with Fone Zone/Telstra recently, but when my Dad spoke to my uncle (who lives in Philadelphia), he told us that he could purchase one for me outright and then we could still put me on the Hiptop plan so that I wouldn't be stuck on a plan I couldn't afford and could pull out any time if I got into some form of trouble with making payments.
So, my question is, would our plan be successful?
Could I use an Australian sim card in a Sidekick Slide if my uncle purchased one for me and sent it over here?
Do they even have a sim card slot?

Could I still be put on the Hiptop plan if I got the phone outright overseas?
Thanks!