Glenn Mulcaire taught others how to listen to voicemails
24 June 2014 Last updated at 16:08 BST
Glenn Mulcaire was the private investigator at the heart of the News of the World phone hacking operation.
He has admitted conspiring to intercept voicemails.
Mulcaire kept hundreds of his own recordings - and in this one he talks a reporter through how to listen to voicemails in relation to Gordon Taylor, head of the Professional Footballers Association.