Nope! This is the F501i, the Fujitsu-made 501i series i-mode phone. The first i-mode phone, and apparently the device that brought us the concept of emojis. This came out in February 1999, but I don't think Sega supported it in any capacity until December. What does "support" look like? https://web.archive.org/web/20001203075900/http://www.sega.co.jp/sega/kara/melody.html Well they sold ringtones... using Sega Kara branding, because when you think of karaoke, you think of a device that can only do simple beeps. The 502i series could do chords! And some models were in colour! The 503i is maybe more important because it can run "i-appli" programs. These are J2ME-based - I'm not sure if there's more to it than just a rebrand, but J2ME makes game development a bit more pleasant. Sega actually bothered to document 503i software online, which is why I got confused - life under the 501i and 502i regimes is not very well understood, particularly outside of Japan. But I did find something: https://retrocdn.net/index.php?title=File:ImodeGameKanzenKouryakuGuide_Book_JP.pdf&page=58 i-mode Game Kanzen Kouryaku Guide (iモードゲーム完全攻略ガイド) from August 2000, this book lists pretty much everything game-related on the i-mode platform. And... it's very basic - most of it is black and white, text-based stuff with some low resolution graphics. I think the most game-like things up there are Sakura Taisen-branded versions of Columns and Black Jack, though it's more impressive than most of the other game companies trying to capitalise on this service. I would be incredibly surprised if any of this has survived, given you have to go hunting to just to find Sega acknowledging the service. I think they were all just testing the waters at this point. Hey remember Sonic Cafe? All those Sonic mobile phone games that nobody over here knew about until a decade after they were launched? Turns out our coverage has been very "selective". We only have pages about Sonic-related games, but Sonic Cafe was more of a "Sonic Team" thing than a "Sonic the Hedgehog" one. Because here's the thing, Sonic Cafe launched alongside the first 503i series handsets in January 2001. And the original four bits of software... weren't even Sonic games. In fact most 503i-compatible software you could download from Sonic Cafe... weren't Sonic games. Later ones were, but loads of franchises were represented. What about the West? https://forums.sonicretro.org/index.php?threads/four-undocumented-sonic-games.36442/ Well my digging back in 2017 is still mostly correct - US-based Motorola (who apparently had a hand in the development of J2ME) got all excited about the platform and announced a deal with Sega in June 2000. But they didn't get their phone out until the summer of 2001 and I'm not overly sure how much of their initial announcement it to market. Maybe none of it (although the game Borkov was built-in to the i85s (and i88s?)). Sega Mobile was later a thing, but not until April 2002, years after Japan.