I recently began calling up people who fill out the lead capture form on my website (name, email, phone). I'm based in the US, and calling US numbers is no problem.
But my product is available worldwide and I want to call and speak to international prospects as well. I'm already using Google Voice, but I'm open to other calling solutions.
I have a few questions:
I have had good success using Skype to call internationally. It's very simple to use and the quality of calls is good.
If you wanted even less technical, just send their IP address with the email and then manually look up their country based on IP address on one of the many websites that do this.