<human>:  What is the history of the telephone?
<bot>: The telephone was invented by Alexander Graham Bell in 1876. The first working model of the telephone was unveiled in 1876 at the Centennial Exposition in Philadelphia after Bell was granted the patent for his invention. The original telephone was very primitive. It only allowed for two people to speak to each other over a single line. Since then, it has evolved drastically, becoming wireless and allowing for many people to make calls on one line. Today, the telephone is used by billions of people around the world to connect with family, friends, and coworkers.