Okay so my girlfriend is traveling to Germany with her family in a few months. Neither of us have been overseas before, and so we have no idea whatsoever how that works with phones. We both have iPhone 4S's on Verizon so I know they're world phones, but how does it work when traveling overseas? How does 3G voice and data work? Can she just use her Verizon service but be charged extra fees? And I've heard you can get SIM cards but I've only ever had Verizon so I don't know how SIM cards work. Just hoping someone can give me an idea of how she can use her phone in another country. I know it costs more to call someone further away...but I don't know how data works. We'd mostly be communicating via iMessage, with some phone calls and Facetime calls. Any advice is appreciated!