A teenager faces jail for stealing Tony Blair's address book and publishing it on the internet.
Junaid Hussain, 18, from Birmingham, hacked into the personal Gmail account of the former Prime Minister's special adviser Katy Kay using an ID 'Trick'.
According to The Sun Hussain took email addressees and private phone numbers of Mr Blair, his wife, and sister-in-law, as well as contacts in the House of Lords and Parliament.
The defendant pleaded guilty to publishing the address book and admitted to making nuisance telephone calls to a counter-terrorism hotline at a Plea and Case Management Hearing at Southwark Crown Court in London.
The court heard how he made hoax calls to the helpline between January 1, 2010 and 14 April 2012, which prevented legitimate callers getting through.
He will be sentenced on July 27. A further offence was left to lie on file.
The investigation was conducted by the Police Central eCrime Unit, who investigate the most serious cases of cyber crime.
Scotland Yard said further investigations are ongoing into the activities of other members of Team Poison.
Defending Ben Cooper said the teenager's offences had been a prank.
Judge Peter Testar told Hussain he should be under no illusions that he could go to jail.