Recently one of my online pals was looking for something I was looking for.
International DID's that anyone can buy without being a carrier who buys via client VOXBONE. So he found one, and I found one.
These numbers work great and what I'm doing is making my GrandCentral number globally reachable so I can call in, grab my messages and return calls by dialing locally, at local rates, in countries I visit. I've also added numbers via GizmoProject and VoIP User that let me do the same thing.
This isn't for everyone. But for those who spend lots of time in the same countries, they're sure worth it.