[miketab]

yes I have but not with iphone, I have many unlocked phones and no the sim card from sprint will not work in the us. if you have your touch pro2 unlocked for us carriers you can try it yourself by switching it to gsm. there is no gsm network for sprint in the us.
having said that i see no reason why it would not work outside the us using the gsm network.
i was wondering just for curiosity, if I would take my sim card that is activated on my account and give it to someone out of the country , if we can use sprint data service at the same time.

anyways to answer your question, no iphone on sprint atleast for now