James tackles a 1957 Bakelite dial telephone - 211 pieces, most of them very small indeed, must be reassembled in the correct order if this telephone is ever to ring again. From the receiver with its carbon filings that enable speech to be amplified, to the electrical pulses created by the dial itself that connect the phone to the outside world, James soon discovers that every single piece of the telephone played a crucial role in revolutionising communication around the world.