Forty years ago today, in 1973, history was made. A phone call was made that changed the world forever.

Inventor and former Motorola vice president Martin Cooper made the very first mobile call on Sixth Avenue in New York City to the head of research at Bell Labs, who had also been in the race to construct the first cellphone.

The conversation was on a 10 inch long prototype Motorola Dyna TAC weighing a bulky 2.5 pounds. We have come a long way in the last 40 years with modern smartphones measuring about 4.5 inches long and weighing a mere four ounces!

Making one of the most significant milestones in mobile electronics, Cooper opened the door for unlimited innovation and continues to progress mobility in our everyday lives.

“Today, Cooper helps run the tech incubator Dyna LLC. He also works as an adviser for companies and the government on telecommunications issues,” according to USA Today.

Click here to read more about the call that made history and the man who made it happen.