The New York Times, quoting current and former US officials, said that Chinese intelligence men often read on President Donald Trump's uninsured mobile phone when talking to his old friends.
The newspaper said Wednesday that Beijing is using what it expects in these calls to influence US policy.
Trump has repeatedly warned his aides that his mobile phone calls are unsecured and that Rossa's intelligence officers are constantly talking about his conversations, but they say the president still refuses to give up his mobile phones.
Business Insider said the phone was intended for iPhone and that the president did not want to give it up.
US intelligence services have learned from personalities in foreign governments, and by intercepting contacts from foreign officials, that China and Russia are relying on the president's calls, officials said.
The White House did not comment on the New York Times report, which Trump regularly attacks, accusing it of publishing "false news."
The newspaper quoted the officials as saying that China is seeking to exploit the calls intercepted to see how Trump thinks and who takes his opinion and the best way to influence it.
According to the newspaper, Beijing is trying to exploit what it aspires to stop the escalation of trade war between the two countries now.
Chinese officials rely on Chinese businessmen and others with connections to Beijing to convey arguments and views to Trump's friends to influence him, the New York Times said, quoting US officials.
