Donald Trump on his phone, a Samsung Galaxy, during a campaign stop in February.The code has been cracked.Donald Trump's campaign has revolved largely around his Twitter presence. Many of his tweets are a mix of the enthusiastic, colorful and vitriolic. But not all of them. Some are downright dull. Some sound like campaign press releases. What gives?Apparently, he's not the only one&nbsp;with the keys.A visual effects artist from San Francisco pointed out something interesting Wednesday.&nbsp;When you send a tweet, Twitter records and displays which device or service you used when hitting send.&nbsp;Some of Trump's tweets are "via Twitter for Android," and some are "via Twitter for IPhone.""Every non-hyperbolic tweet is from his iPhone (his staff)," Todd Vaziri wrote. "Every hyperbolic tweet is from Android (from him)."A data scientist took it a step further, creating a complicated algorithm to parse which tweets came from which sources. In a blog post, David Robinson shared what he found when he analyzed the tweets that came from iPhones versus Androids.Overall, it seems that Trump himself is the one penning tweets blasting "Crooked Hillary" and the "dishonest media." He's also the one doing most of the retweeting of occasionally questionable&nbsp;charts, quotes, sources and Photoshopped pictures.His staffers appear to be the ones tweeting generic messages of thanks to cities where he's held rallies.&nbsp;And the scientist found in&nbsp;some cases it seems like there's a staffer "whose job is to imitate Trump&rsquo;s unique cadence" in some tweets."Trump&rsquo;s Android account uses about 40-80% more words related to&nbsp;disgust, sadness,&nbsp;fear,&nbsp;anger, and other 'negative'&nbsp;sentiments than the iPhone account does," Robinson concludes.Trump has been photographed with his phone, which is a Samsung Galaxy (see the&nbsp;photo above for a&nbsp;cameo of the device). A New York Times story from October noted he repeatedly interrupted an interview with the journalist to check his Galaxy, even firing&nbsp;tweets and pointing out his mentions.