Somebody tracked his tweets and until recently the insane ones came from an Android phone (which he was known to use — an outdated, insecure version no less,) and the more professional-looking ones came from an iPhone (and not at three in the morning.) It appears he switched to a new iPhone around the 8th.
People more familiar with the Twitter API may be able to glean more information.
ETA: Remember when Obama took office and wanted to stay on the Blackberry platform? The Secret Service eventually allowed it, but instituted strict rules and had a specially hardened one made for him. You’ve got to wonder what they were doing letting the Cheeto keep using his obsolete and vulnerable Galaxy.
