Why Do people want Voice over IP?

because it's usually way, way cheaper than conventional telephone service.

Advantages of the VoIP Technology:

You can save up to 90% on your local, long distance and international phone bills using internet phone service. You can make a voip call through an IP Phone, VoIP Adapter or your computer. You have to use a special adapter if you want to use the internet phone with your ordinary land-line phone set. After the installation of adapter, your phone will work just like an ordinary phone. IP phone is more convenient for taking advantage of many of the extra features that are included free with your voip service account. It short, it does not require a very complicated system in setting up.