I'm taking my Stateside purchased iPhone4s to Italy next month. Couple things I need to look into. My service is with Sprint. If I want to buy a sim card over there for emergency calls (in Italy, not back to the States), do I need to do anything in advance? Any recommended brands to look for? I know my Mac computer can plug into European outlets with 220 volts (whatever it is) if I have an international plug adapter that will fit. But the Mac is staying home. Instead, it will be an iPad and iPhone. For charging, can they handle the current too? I'd love to hear any other helpful thoughts on this. Thanks!