It included his name, address, date of birth, National Insurance number, mobile telephone number and the fact he was "probably EPIU" - referring to his union membership.

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He is accused of grabbing her hand, persuading her to go into a laundry room, getting her mobile telephone number and threatening to "release confidential information" about her to her employer.

BBC: NMC's Aldwych building in London

" Jonathan Donner, a researcher at Microsoft India who published a paper on "The Rules of Beeping, " said: "Beeping is simple: A person calls a mobile telephone number and then hangs up before the mobile's owner can pick up the call.

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It follows official data from Spain indicating its number of mobile telephone and datacard subscriptions fell by 5% over the same period.

BBC: Mobile phone sales fell in 2012, suggests study

Communication has moved from the telephone landline to the mobile phone to Internet telephony with Skype to now apps like GroupMe with mobile communications services which do not rely on a PC or telephone number.

FORBES: Skype To Acquire GroupMe For Group Messaging