BORIS Johnson’s personal data could have been compromised after sending messages to the Saudi Crown Prince on WhatsApp.
A source said they were “99 per cent sure” the PM texted Mohammed bin Salman.
The ruler is alleged to have hacked the phone of Amazon founder Jeff Bezos with a corrupt WhatsApp message.
It is believed Mr Johnson would give out his number to world leaders when Foreign Secretary.
Simon Collis, UK ambassador to Saudi Arabia, is also believed to have shared messages with the prince.
An ex-Foreign Office source told The Telegraph it was “commonplace” to communicate with Middle Eastern notables over WhatsApp.
A Downing Street spokesman said: “This is not something we would comment on.”
It is claimed the prince tried to intimidate Mr Bezos so his Washington Post newspaper would tone down its coverage of the 2018 killing of journalist Jamal Khashoggi.