Her Chinese counterpart Hua Chunying too dismissed the U.S. report and used the opportunity to promote a Chinese electronic manufacturer, while apparently mocking Trump's "America first" policy. Trump, however, ridiculed the idea in a morning tweet.
Trump's refusal to abandon his personal phone has been well documented, but this latest report from the Times delves into the implications of the president's indifference to securing his communications.
Mr. Trump is supposed to swap out his two official phones every 30 days for new ones but rarely does, bristling at the inconvenience.
It's alleged that China is taking note of who Trump speaks to most frequently, so he can be targeted with pro-Chinese messages.
The White House did not immediately respond to requests for comment about the Times report.
American spy agencies learnt that Beijing and Moscow were eavesdropping on the president's calls from sources inside foreign governments and by intercepting communications between officials, it was claimed.
On the bright side, Trump is not comfortable exchanging emails on his phone and this apparently rules out any phishing attack, which many believe it to have happened to Hillary Clinton during her stint as the Secretary of the State.
US President Donald Trump likes to tweet and make calls from a personal iPhone. In China, the government owns all three telecommunication carriers. It would have the advance that it can tell the time.
By listening to his phone calls, China is also developing a sense of which arguments and techniques can sway the President. Meanwhile, Trump's supporters continue to call for Hillary Clinton to be jailed over her use of an unsecured private email server.