So I'm traveling to Italy next month and I'm trying to figure out the best way to use my iPhone 4 while I'm abroad. I'm currently on AT&T and my device is updated to the latest version of iOS. Am I correct in my understanding that the current version cannot be unlocked? If so, should I just get the international plan or are there any apps that will let me make cheap calls? I have talkatone and I believe I can make wifi calls with the apps using my Google Voice account but will that work in Italy? Any other recommendations or things I should know before I go? Thanks.