In this BBC documentary, Jeremy Clarkson takes a look back at the telephone, a revolutionary invention that changed the world. Videos (7-parts) after the jump.

The telephone or phone is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other

Part 1

Part 2

Part 3

Part 4

Part 5

Part 6

Part 7