Mr. Trump typically relies on his cellphones when he does not want a call going through the White House switchboard and logged for senior aides to see

The New York Times:

Mr. Trump has insisted on more capable devices. He did agree during the transition to give up his Android phone (the Google operating system is considered more vulnerable than Apple’s). And since becoming president, Mr. Trump has agreed to a slightly cumbersome arrangement of having two official phones: one for Twitter and other apps, and one for calls.

Mr. Trump typically relies on his cellphones when he does not want a call going through the White House switchboard and logged for senior aides to see, his aides said. Many of those Mr. Trump speaks with most often on one of his cellphones, such as hosts at Fox News, share the president’s political views, or simply enable his sense of grievance about any number of subjects.

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just like any president or senior level official…