Well in spite of having been a huge international success for many years, Square still seem to be focusing mainly on their home market in Japan. The rest of us aren't nearly as important to them it seems. There's probably quite the market for cell phone games in Japan, otherwise, I bet that's why Square's making games for phones. Eventually we will probably catch on here in the west too. I wouldn't be surprised if, in a couple of years, Sony would begin producing cell phones with the Playstation brand (they are already doing it with the Walkman, so why not?) and perhaps even Nintendo will in a not so far away future make a handheld which will double as a cellphone
