LinuxPlanet reviewed Skype and found it works just fine and costs “peanuts”.

I simply loaded Skype on my Linux notebook, bought some minutes on the Skype Web site, and started talking. Mac and Windows users will also find versions for those platforms.

A basic set of ear-buds and a small handheld microphone were all I needed to make calls. And, they packed into the laptop bag easily. The sound quality was very good. I started out with a USD 10 credit. Over the course of several days, I rang up about an hour of talking… for the travel budget-busting price of around US$1.60.