Voice over Internet Protocol (VoIP) is a voice communication technology designed to transport your voice over the Internet. You can place and receive calls using VoIP, and it is also possible to port a landline number to VoIP. VoIP digital signals are converted to analog, if necessary, before they reach their destination. With VoIP you can place a call from a computer, a special VoIP phone or a traditional phone using a special adapter. Cable Internet providers offer VoIP telephony, as do some old guard telephone carriers. It may not be apparent if you actually have VoIP.
Examine your telephony equipment. How do you place phone calls? If you place telephone calls through your computer or using software, you have VoIP. If you have a device provided by your telephone carrier, which accepts a plain old telephone and also plugs into the Internet, you have VoIP. A cellular phone is not VoIP, although you can use VoIP on some mobile devices.
Gather information about your carrier. Just by name, you may be able to tell if you have VoIP. Vonage, Magic Jack, Google Voice, Skype, and Voipo are but a few examples of VoIP carriers.
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Perform a reverse telephone number search. If you don't know who your carrier is, plug the number into Fone Finder or Reverse Phone Directory. These free sites can tell you who the carrier is for a given number.
Call or email your telephone carrier and ask. If it still is not clear, you can always just ask your service provider, and they will tell you if the service is VoIP.