Hi, I will stay in New York and Miami for the next few weeks. I am now thinking about getting a prepaid / pay as you go plan for mobile internet, because roaming is kinda expensive (I'm from Germany). I want to use this sim with an iphone 4, so I would need a microsim. Can anyone help me out with a quick idea which plan to choose? I already had a look at t-mobile, but I heard that I wouldn't be able to use 3G on their network, right? Any recommendations? I only need a few hundred mb during this time, and I don't want to have to search for open wifis forever. I wouldn't text or call anybody with this card. And a second question, before opening a second thread for this: Any suggestions for an offline navigation app? I am kinda pleased with navigon, but it seems to be unavailable for the us.