Hi everyone, I'm sure this has been discussed somewhere on this site, but I can't find it in search... sorry if it's a repeat. I'm traveling to Denmark and Germany for two weeks this summer, and I'd like to bring my old GSM iPhone 3GS with me (which I understand AT&T will unlock for me). I'd like to be able to make local phone calls, check email, and use Google Maps, so a pay-as-you-go SIM seems like the right thing to do (is it?). I suspect I only need maybe 100 minutes and 250mb of data. Does anyone have any suggestions on which carrier I should go with? Will I need to get a different SIM for each country? Where can I buy such a SIM card? Thanks very much.