Taking my GNex to Europe

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http://forums.androidcentral.com – I'm definitely appealling to the techies who know their stuff, which I certainly don't. Basic stuff, I'll number my questions. 1. Will it dial and get on the voice networks in Europe? I'll be all over but probably mainly in Slovenia and Croatia. 2. Will data/web work, and if so, should I turn it off if there are crazy roaming all the way over there? 3. I can get on wifi and my understanding is it will work over there just like how it works here. (this one isn't really a question unless there's something I'm unaware of and should know about). 4. What kinds of connectors or (HowTos)