The first cellphone was invented fifty years ago this week. The man who built that phone, Martin Cooper, is now 94 years old. Cooper, who has been called the “father of the cellphone,” has been speaking with the media as he looks back at his efforts to create a device that greatly changed our world. In the early 1970s, Cooper worked for American technology company Motorola. At the time, Motorola and other manufacturers were attempting to create wireless phones that could work in vehicles and also be carried. There was intense competition between Motorola, Bell Labs and AT&T to build the first truly portable phone. The technology used to create the first cellphone is known as cellular. This technology uses many small, interconnected transmitters that give off wireless signals and connect cellphones to the internet.