Who made the first ever cell phone call in the world?

The cell phone has become an integral part of our daily life.So, while I had been wondering where the cell phones were originated from, I found there is an interesting story about first cell phone call. Marty Cooper--the then general manager of the Motorola's communications system division--is known as the father of cell phone; he was the one who made the first ever call over a cell phone to his rival Joel Engel at the Bell's Lab.
Here's the story about the first cell phone call:
http://www.cnn.com/2011/OPINION/04/01/greene.first.cellphone.call/index.html
Here's more about Marty Cooper.
https://en.wikipedia.org/wiki/Martin_Cooper_(inventor)
Enjoy reading!!!