Re: XDA
And you know who had non-color touchscreens using a stylus before any of them? Apple, with the Newton. If you want to play the "who got there first" game with such a wide net Apple still did, unless you want to include scifi and use Star Trek's pads or probably something from the silent film era.
Apple made the first smartphone that ordinary people wanted to own. Sure they existed before that, in various forms which included in some cases ones not that different from today's phones. But they were for geeks and PHBs, a regular consumer wouldn't buy them anymore than they'd buy a Raspberry PI today.