No one foresaw this at the start of Trump’s second term, when the number was closely held by the president’s friends and a handful of journalists who used it sparingly. So many people now call Trump on his private iPhone that his advisers have stopped trying to keep track. Sometimes in meetings, he will leave his phone face up, allowing staff to gawk at the flashing notifications of incoming or missed calls that pile up on his screen. Only some of them are from numbers that have been saved in the device. “It is literally call after reporter call,” the first official said. “It is just boom, boom, boom.”