Why VOIP is cheaper than a traditional telephone call

A traditional phone call relies upon connecting two phones,physically. To say the wire must be extended from one phone to the other and the longer the "line" is kept open the more expensive the call gets.

A VOIP (Voice Over IP) call , on the other hand, does not create any line link that can be metered or charged. VoIP technology takes one caller's voice, makes it into small packets of digital data and sends them over the internet, just like an email you sent or web page you browsed.
Each packet of this voice data carries with it details of its intended destination and the voice itself albeit a piece of it. When they arrive at the destination, after passing over many a routers, all the packets are reassembled into the original voice message.
Thats, how you hear it, same goes for the replying to that voice message.

There is a lot more that this to a making a VOIP call, I will carry on this info on a series of articles. Lets say "what VOIP is", later