During the live interview, the presenter handed the PM a card with a list of names on it, saying that they were people Mr Cameron knew and asking whether he would be talking to them.

BBC: UK Politics

It was demonstrated at the Ekoparty security conference last weekend, during which time presenter Ravi Borgaonkar also showed how a different code could even wipe your SIM card.

ENGADGET: 'Dirty USSD' code could automatically wipe your Samsung TouchWiz device (updated)