Vonage is a revolutionary new phone service that uses a broadband Internet connection. If you have a broadband Internet connection, Vonage can relay your voice over the Internet using a regular phone and a phone adapter. This is a technology known as VoIP. All you need is a broadband connection (such as DSL or Cable) an Ethernet router with a spare port and a regular corded or cordless touchtone phone. Vonage provide a free phone adapter when you sign up.
Skype is a free computer program that lets you make voice calls over the Internet. Calling another Skype user anywhere in the world is always free.
Skype is a great way to make free, long distance calls and their website makes it clear and easy.
They also sell a range of gadgets to make it even easier to use your computer to make free phone calls.