For at least two years, an open secret lurked in the the metadata behind President Donald Trump’s personal Twitter account. Folks quickly noticed that his boring tweets—event announcements, press releases on polls—were usually sent from an iPhone, probably a staffer’s. The 3 a.m. rants, on the other hand, were generally sent from an Android. Guess which kind of phone Trump uses personally?

This was great for data-minded journalists like myself, because we could infer when Trump himself was tweeting, tapping away at his Samsung Galaxy. Trump tweets were quantifiably different than staffer tweets, angrier and posted later at night (not to mention more poorly spelled).

But in recent weeks, the Android tweets have slowed to a trickle, an indication that the White House might finally be taking the security risks posed by the president’s Twitter account seriously. Trump now appears to post mostly from an iPhone, if he still tweets at all.