Been able to test it, made a couple of calls to the US. Call quality was really good, I had it set to medium but it was clear and consistent all throughout the call. First call lasted for an hour and then it dropped. No problem, called back and good to go again. I think the dropped call after exactly an hour might be set up that way. I hardly ever make such long calls so if that's the only issue I'll be happy to live with that :D Really happy I found this.