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Well T-Mobile just stepped it up a notch for ya.
T-Mobile Unleashes Summer Travel with Unlimited High-Speed Data in Europe
Certainly if you're going to Europe this summer, your problem is basically solved with TMo.
I don't think that's how Google Voice/Hangout numbers work. Google Voice numbers works as call forwarding. You can straight up do voice chat through Hangout with other people with Hangout. In order for your Google Voice to be setup as VoIP, you'll need third party apps, if they still work. (Last I checked, only certain hardware like Obihai and GVJack for MagicJack still works. I don't believe any iOS or Android apps work.) Correct me if I'm wrong.Set up a forward to a google voice number and wherever you have data you can get unlimited calling free, pretty much.
This doesn't seem too bad considering the roaming charges I guess!This is a little bit of thread necro but I travel overseas for work a lot -- mostly to Ireland, England, Germany, and Japan. I am a T-Mo customer and the free international roaming described above works PERFECTLY. I just got back from two weeks in Japan. When I got back I had a grand total of $0.60USD in international charges from when I had to call a USA landline for ~5 minutes.