As far as I know, you can't yet. Not until someone devises a way to dump the files and programs a working cell phone emulator. Given the release of Seiken Densetsu 1 and 2 for cell phones, however, I wouldn't doubt that someone is up to the challenge. Heck, I want to play an English translated 16-bit Seiken Densetsu someday.
That SeiDen port has been out for years and I haven't heard of anyone emulating it (or even dumping the game files) and now that Squenix has stopped offering it... pity because I wasn't a huge fan of the GBA remake and would have loved to play the original game with the color and improved graphics of that mobile remake.