So there never was a gap. He just used White House landlines and other official phones, an obvious thing which was conveniently left out from earlier speculative articles.

"The six pages of White House switchboard logs for January 6, 2021, are completely based on an official review of White House records, according to a source familiar with the matter. There are no missing pages and the seven-hour gap is likely explained by use of White House landlines, White House cell phones and personal cell phones that do not go through the switchboard."