The Metropolitan Police confirmed it had spoken to a 48-year-old journalist as part of Operation Golding, an off-shoot of Operation Weeting, which probed illegal phone interception at the News of the World and was later widened to include Trinity Mirror newspapers.
Those capability names are set out in a much broader 2010 presentation that sheds light on spy agencies' aspirations for mobile phone interception, and that less-documented mass-collection abilities.
That is the strand of Operation Weeting that is investigating allegations of phone interception at Mirror Group Newspapers.
The NSA said its phone interception techniques are only used against valid targets, and are subject to stringent legal safeguards.
A Metropolitan Police spokesman said detectives were questioning a suspect over the phone interceptions and perverting the course of justice.
Methods including phone and computer hacking, blagging - faking an identity to draw information from an official spokesman - and phone interceptions.
Ms Field, who recently withdrew her long-standing phone-hacking claim against News International (NI) and faces costs of more than £75,000, contacted the police at the end of May after a meeting with a senior detective working on Operation Weeting, the specialist Metropolitan Police unit investigating illegal phone interceptions.
Mr Silverleaf successfully argued for a pre-trial psychological evaluation of Mrs Church to be undertaken before Monday's trial date, along with a specific examination of the family's pub business, said to be affected by years of illegal phone interceptions by Mr Mulcaire and the NOTW.
More intelligence means being able to better place informers on the ground and use cell phone interceptions.
"Where Police use an interception device on a phone line, all calls are recorded by the Crime Monitoring Centre (CMC), a national 24-hour monitoring service.
The news comes as growing criticism of the Met's investigation into widespread mobile phone message interception by the News of the World is mounting.
