I don't have Discord, though I'm seeing links to Discord discussions all over the place, especially in the jams. Do I need a smartphone for it? Gah! I forgot. I got my first smartphone recently, so I do actually have one. I just haven't gotten used to working it yet. I go on the Twine subreddit?
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Yeah, you can get Discord on your smartphone, but you can also download it to your computer as an application or open it in your browser like a normal website (blue button). Lots of ways to get it. The subreddit's good too, of course!