Internetcalls.com is part of a large network of similar services offering free pc to phone calls. With their service, you can use the internet or even your normal telephone to place free international calls.

How it works
You sign up for an account and download their software. You can call a large number of countries completely for free.

The Catch
Unless you buy credit ($10 worth) your calls will be limited to only around 5 minute per call. I bought $10 of credit and can talk for an hour with paying…

Phone to Phone calls
Go to the website internetcalls.com. Type in your phone number and the destination number. It will connect any two phones together. (Great for practical jokes).