http://www.magicjack.com/1/index.asp

It's a plug in device for your computer that you can use to make and receive phone calls with. supposedly you can stop your phone service and use only magic jack tas your phone for a yearly payment - way cheaper than a phone bill.

[What type of internet service do I need?
Any of the following: Broadband, high-speed internet, cable internet, DSL, WiFi or WiMax.
magicJack does not work over Dial-up or satellite internet.]


FAQ page-
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http://www.magicjack.com/1/faq/