I realize this is not an electronic's discussion board, but as international professionals, I figured many people on here would know. If I get a Blackberry here in the U.S., can I travel to say Europe or Asia, buy a pay-as-you-go sim card there, and just pop it in my Blackberry to use while I am there? How about with a Treo? Can I do that? I can't seem to find the info. on the internet (guess I am not really sure how to search for it). Also, what do you prefer: Blackberry or Treo?